technical physics

Teenage Mutant Ninja Turtles Museum Master Line Statue

Prime 1 Studio is proud to present Donatello from Teenage Mutant Ninja Turtles . The tallest and smartest of the turtles, Donatello relies heavily on high-tech equipment and gear. His unmatched intelligence is a huge asset to his brothers, who rely on him for all of their technical needs. Sporting his purple bandana, and a bo staff slung across his back, Donnie is brains and brawn, all in one package. Donatello Statue features movable eye and features theme base fit with other brothers.Limited Edition of !Product Size: 63 x 60 x 45 cm Please note: Additional shipping cost will apply for customers outside of the EU. If you contact us with your shipping address, we will gladly determine your shipping costs, based on your location.

JB Systems Smooth Scan 3 Laser USATO POCHISSIMO

JB Systems Smooth Scan 3 Laser usato pochissime volte. Acquistato senza telecomando il quale non è indispensabile per il suo funzionamento! Controllabile con centrallina DMX con connessione classica XLR 3 poli. Class 3B laser based onred green laser oSeveral working modes: DMX-control: 1channel for easy operation or 17 channels for full control Standalone: sound activated (internal mic) or automatic Technical Information Mains Input: AC V, Hz Fuse: 250V 1A slow blow (20mm glass) Total Power consumption: 13W Sound Control: Internal microphone DMX connections: 3pin XLR male / female DMX channels: 1 or 17 channels DMX starting address: Laser radiation class: 3B Scanner speed: 15kHz Working temperature: 10'C to 40'C Laser Safety Standard: EN/IEC Ed Size:190 x 170 x 80mm Weight: 1.5kg

Sharks of the World(FAO Species Catalogue Volume 4)

Sharks of the World: an Annotated and Illustrated Catalogue of Shark Species Known to Date (FAO Species Catalogue Volume 4) Campagno, Leonard J.V. Bookseller: Attic Books (ABAC, ILAB) (London, ON, Canada) Bookseller Rating: Quantity Available: 1 Book Description: United Nations Development Programme, Rome, . Paperback. Book Condition: Very good. 2 volumes. viii, 655 pp. Maps. Illus. FAO Fisheries Synopsis, No. 125, Volume 4. Bibliography. Index. Spine faded, with sticker removed. Some highlighting. Part 1 - Hexanchiformes to Lamniformes. Part 2 - Carcharhiniformes. includes 342 shark species belonging to 8 orders and 31 families. Includes glossary of technical terms and measurements. Species accounts given, along with scientific and vernacular names, information on habitat, biology, and fisheries. Includes distribution maps. Appendices on shark attack and preserving sharks for study. Bookseller Inventory #

Obiettivo Carl Zeiss ZF.mm x Nikon

Pioneer of the close-up shot So near, yet so far away A dragonfly lands on a water lily and behind its shimmering body, a profusion of flowers stands out clearly. The Distagon T* lens from Carl Zeiss opens up vistas of translucent depth and sharpness. Its not afraid to approach to within just a few centimeters of the tiniest motif without losing sight of the bigger picture. Technical Specifications Focal length 25 mm Aperture range f/2.8 f/ steps) Focusing range 0.17 m infinity Number of elements/groups 10/8 Angular field, diag./horiz./vert. Coverage at close range 83 x 55 mm Filter thread M 58 x 0,75 Dimensions (with caps) 64 mm, length 90 mm Weight 480 g Camera mounts F Mount (ZF.2)

Libri scientifico

Vendo libri usati e in buone condizioni per le scuole superiori: -Terra da scoprire. Con espansione online. Per i Licei e gli Ist. Magistrali (prezzo €) -Dal carbonio agli OGM. Biochimica e biotecnologie. Con Biology in English. Con e-book. Con espansione online. (prezzo €6,00) -Biologia. Blu. La chimica e i suoi fenomeni-Dalle cellule agli organismi. Con espansione online. (prezzo €) -Amaldi per i licei scientifici. Con Physics in english. Con espansione online (prezzo €) -Matematica.blu 2.0. Con e-book. Con espansione online. (prezzo €) -Veluti flos. Con espansione online. (prezzo €) -Rosa fresca aulentissima. Con espansione online. Volumi 5 e 6 (prezzo €) - Rosa fresca aulentissima. Ediz. rossa. Con espansione online. Volumi 1 e 2 (prezzo €) -Uomini e idee. Con espansione online. Per i Licei e gli Ist. Magistrali: 3 (prezzo €) -Alla ricerca del presente. Con espansione online. Per le Scuole superiori: 3 (prezzo €) - Only connect... new directions. Ediz. blu. Con espansione online. Con CD-ROM. Volume 2. (prezzo €) -David Copperfield, ESO. Material auxiliar (prezzo €5,00) -Lineeimmagini. Vol. unico. Con espansione online. Per le Scuole superiori. Con CD-ROM (prezzo €) -Il Cricco di Teodoro. Itinerario nell'arte. Ediz. verde. Con espansione online. Volume 3 (prezzo €)

All about Futures: The Easy Way to Get Started

ISBN: , SKU: , AUTHOR: Wasendorf, Russell R., Sr. / Wasendorf Russell, PUBLISHER: McGraw-Hill, Since 's first edition of this bestselling book, the futures market has changed incredibly--Internet access and electronic trading dominate the market, options have grown in importance, and a greater number of futures markets exist worldwide. All About Futures, Second Edition, covers all the updated basics of futures trading for the beginner, and illustrates trading strategies from the simple to the complex for experienced traders who need to brush up on their skills. An integral element in McGraw-Hill's All About series, this completely revised and updated book discusses: *Detailed Internet strategies for effective electronic trading *Basic approaches to technical analysis and anticipating price direction *Insights on working with a broker and developing a trading strategy

Obiettivo Carl Zeiss ZE 2/35mm mm x Canon

Versatile reporter The right moment, when it comes, is a unique interaction of chance encounters. The Distagon T*2/35 lens is the weapon of choice to visually document these precious, decisive moments. The medium wide-angle lens captures the scene in all its natural brilliance. In the half-light nothing escapes its gaze. With its lightning-fast focus, its armed for the most unexpected events. Technical Specifications Focal length 35 mm Aperture range f/2.0 f/ steps) Focusing range 0,3 m infinity Number of elements/groups 9/7 Angular field, diag./horiz./vert. Coverage at close range 19 x 13 cm Filter thread M 58 x 0.75 Dimensions (with caps) 64 mm, length 97 mm Weight 530 g Camera mounts EF Mount (ZE) F Mount (ZF.2)

Materials Production in Open and Distance Learning

ISBN: , SKU: , AUTHOR: Lockwood, Fred, PUBLISHER: Paul Chapman Publishing, The process of materials production in open and distance learning is seen both as a daunting prospect and as an exciting opportunity. This book is intended to dispel some of the apprehension and yet temper some of the enthusiasm. The chapters are grouped into three accepted stages of materials production - planning, production and presentation - with each chapter having an underlying theme: the desire to produce materials of the highest academic and technical quality that are also the most effective teaching materials for its learners. The authors, many with national and international reputations, focus on those facets of open and distance learning which reflect current thinking, research and practice. This book will provide educators and trainers with insight into materials production and with an essential foundation upon which to build their own work.

Uomini e idee 3

50% del prezzo originale PER I QUINTI: -AMALFI PER I LICEI SCIENTIFICI.BLU 3/ INDUZIONE E ONDE ELETTROMAGNETICHE, RELATIVITÀ E QUANTI -UOMINI E IDEE 3 PER I QUARTI: -PERFORMER CULTURE&LITERATURE1 (from the origins to the eighteenth century) -STORIA E STORIOGRAFIA PLUS 2B -UOMINI E IDEE 2 dall'umanesimo a kant -NUOVA MATEMATICA A COLORI VOL 4- edizione BLU. Secondo biennio e quinto anno. -L'AMALDI PER I LICEI SCIENTIFICI.BLU-onde,campo elettrico e magnetico con physics in english. PER I TERZI: -PERFORMER CULTURE&LITERATURE1 (from the origins to the eighteenth century) -UOMINI E IDEE 1-dal pensiero greco alla scolastica -BIOLOGIA.BLU- dalle cellule agli organismi -NUOVA MATEMATICA A COLORI-vol3- edizione blu -L'AMALDI PER I LICEI SCIENTIFICI.BLU- vol 1- seconda edizione- meccanica e termodinamica. -ITINERARIO NELL'ARTE 2A EDIZIONE VERSIONE VERDE - VOLUME 2- da giotto all'età barocca. PER I SECONDI: -Massimo bergamini e graziella barozzi-GEOMETRIA-verzione blu. -ITINERARIO NELL'ARTE 3A EDIZIONE VERSIONE VERDE - VOLUME 1- DALLA PREISTORIA ALL'ETÀ GOTICA.

Kit

Kit composto da: PC HP Vectra VL420 con Windows XP,MS Office,Antivirus Avast Monitor 17" Compaq V710 con salva schermo Mouse HP Tastiera USB Trust. Stampante DELL 720 pressocchè nuova fornita senza cartucce, interrfaccia USB. Key Features Printer Type Digital Photo Printer Technology Inkjet Output Type Color Black print speed up to 13 ppm Max Resolution (BW) x dpi Color print speed up to 8 ppm Max Resolution (Color) x dpi Platform PC Technical Features Extend Printer Technology Inkjet Media Type Banners, Envelopes, Hagaki Card, Index Cards, Plain Paper, Postcard Max Media Size Legal (216 x 356 mm, 8.5 x 14") Media Capacity 50 Sheets Dimensions Width 15.9 in. Depth 8.5 in. Height 5.3 in. Miscellaneous Color Gray Possibilità di vendita anche a pezzi singoli con prezzo da concordare.

Insights of Genius: Imagery and Creativity in Science and

ISBN: , SKU: , AUTHOR: Miller, Arthur I., PUBLISHER: MIT Press (MA), How can new knowledge be created from already existing knowledge? "Insights of Genius" shows how seeing is central to the greatest advances of the human intellect. Artists and scientists alike rely on visual representations of worlds both visible and invisible. "Insights of Genius, " first published by Copernicus in , explores the creative leaps that led some of the greatest scientists and artists to dramatically transform how we understand nature. The scope of figures runs from Galileo and da Vinci to Einstein and Picasso. Focusing on the late nineteenth and twentieth centuries, the age of modern art and modern physics, the book travels through the philosophy of mind and language, cognitive science, neurophysiology, and art history. "Insights of Genius" discusses intuition, aesthetics, realism, representation, metaphors, and visual imagery. Allied to these concepts are causality, relativity, energy conservation, entropy, the correspondence principle, scientific creativity, and Cubism. Running through the book is the idea that science extends our intuition from common sense to an understanding of a world beyond our perception.

SUP - Stand up Paddle - Hokua Naish

The Hokua 7'6" GT is the shortest board in the Naish SUP boards range. The technical specs of the Hokua 7'6" GT are provided below: Length             cm) Width          cm) Thickness    cm) Volume          110 L Rider Weight Up to 185 lb (up to 84 kg)  The Hokua (recommended by the Producer to Stand Up Paddle sufers not exceeding a weight of 185 lb (84 Kg),  has a round point nose and a diamond tail. Interestingly, the tail's bottom is characterized by short channels. The rocker is quite pronounced. The Hokua 7'6" GT may be configured either in a Quad and Thruster setup. The board features a GT carbon/wood construction (wood sandwich deck, EPS core and full carbon bottom). Condizioni perfette, Rail Saver Pro. Tavola - sacca - pinne Naish Vero affare!

Obiettivo Carl Zeiss ZE 2/28mm mm x Canon

Explorer of the dark Theres no beating natural light when it comes to creating a powerful, authentic impression. In the half-light of dawn or dusk, or in interior spaces, the Distagon T* 2/28 lens is the perfect companion for the more daring photographer. Its at its best when the lights are low. Without forcing itself into the foreground, it discovers details where others are lost in darkness. Technical Specifications Focal length 28 mm Aperture range f/2 f/22 Focusing range 0.24 m infinity Number of elements/groups 10/8 Angular field, diag./horiz./vert. Coverage at close range 18 x 12 cm Filter thread M 58 x 0,75 Dimensions (with caps) 64 mm, length 93 mm Weight 520 g Camera mounts F Mount (ZF.2) EF Mount (ZE)

Original Sin: Illuminating the Riddle

ISBN: , SKU: , AUTHOR: Blocher, Henri / Carson, D. A., PUBLISHER: Wm. B. Eerdmans Publishing Company, This series addresses key issues in the discipline of biblical theology. Scholarly yet entirely accessible to students, pastors, and lay readers, these volumes avoid technical jargon, interact with the best, most relevant literature, and -- above all -- provide clear and creative insights that help thinking Christians better understand the Bible and its application to contemporary life. In this sophisticated treatment of the biblical evidence for original sin, Henri Blocher offers a robust study that interacts with the best scientific, literary, and theological thinking on the subject. Building his argument on a detailed analysis of the scriptural evidence for original sin, especially looking at key texts in Genesis and Romans, Blocher shows that affirming the traditional belief in original sin is the only way to make sense of evil and wrongdoing.

Arms and Armor: Notable Acquisitions

ISBN: , SKU: , AUTHOR: Pyhrr, Stuart W. / Larocca, Donald / Ogawa, Morihiro, PUBLISHER: Metropolitan Museum of Art New York, This book celebrates more than a decade of collecting by the Metropolitan Museum's Department of Arms and Armor since the reinstallation of its permanent galleries in . The new acquisitions complement and build upon the Museum's encylopedic collection, which totals more than objects from Europe, the Middle East, Asia, and North America. Fifty-eight of the most important recent acquisitions are featured in this volume, including the richly decorated armor and weapons of two French kings, the king of Sweden, and a future king of England, several members of the ruling Medici family of Florence, a hero of the American Revolution, two sultans of Turkey, and the Tokugawa shoguns of Japan. The texts provide insight into the artistic, historical, and technical aspects of this specialized field. Many of these important and intriguing objects are previously unpublished.

Obiettivo Carl Zeiss ZE 2/50mm mm x Canon

Always ready for the chance encounter, the Makro-Planar T* 2/50 has the power to reflect the cosmos in a droplet of water. As a macro lens, it engages our attention at close-up range. As a standard lens, it sees the world in its natural and familiar perspective. Classic portraits are as much its strength as the most striking details from close up. Technical Specifications Focal length 50 mm Aperture range f/2.0 f/ steps) Focusing range 0.24 m infinity Number of elements/groups 8/6 Angular field, diag./horiz./vert. Coverage at close range 72 x 48 mm Image ratio at close range 1: 2 Filter thread M 67 x 0.75 Dimensions (with caps) 72 mm, length 88 mm Weight 530 g Camera mounts EF Mount (ZE) F Mount (ZF.2)

Differential Optical Absorption Spectroscopy: Principles and

ISBN: , SKU: , AUTHOR: Platt, U. / Stutz, J. / Stutz, Jochen, PUBLISHER: Springer, Measurement techniques form the basis of our knowledge about atmospheric composition and chemistry. Presently, important questions of atmospheric chemistry center on urban pollution, free-radical chemistry, degradation of greenhouse gases and the budgets of tropospheric and stratospheric ozone. Among the many different optical spectroscopic methods that are in use, DOAS has emerged as a universal technique to measure the concentrations of atmospheric trace gases by making use of the characteristic absorption features of gas molecules along a path of known length in the open atmosphere. This book reviews the basics of atmospheric chemistry, radiation transport, and optical spectroscopy before detailing the principles underlying DOAS. The second part of the book describes the design and application of DOAS instruments as well as the evaluation and interpretation of spectra. The recent expansion of DOAS application to the imaging of trace gas distributions by ground, aircraft, and satellite-based instruments is also covered. Written for graduate students and researchers with a general background in environmental physics, this book especially addresses the needs of those working in the field of atmospheric chemistry, pollution monitoring, and volcanology.

vendo parapendio Faial Nervures XS

vendo parapendio Faial Nervures XS adatta per il paramotore è una vela divertente, comportamento molto sano per una prestazione eccellente, la gestione è istantanea. L'acceleratore spinge Faial ad una velocità minima 23 alla massima di 50 kmh sfruttabile. offre anche un comportamento sano a bassa velocità sviluppata con tessuto Porcher,linguette di velcro sulla punta delle ali per la pulizia. € 600 Technical Data XS Area (m²) 23.6 Span (m) 11.1 Aspect ratio 5.2 Take off weight (kg) Optimal take off weight (kg) 68 Performances at best take off weight (Measured at m) Max speed (± 2 km/h) 50 Trim speed (± 2 km/h) 38 Stall speed (± 2 km/h) 22 Best glide (± Minimum sink rate (± 0.1 m/s) 1.05 Wing weight (kg) 3.5 DHV1 / 2 E 'certificata EN B / C

BATTERIA ACUSTICA DW PDP X7 Pearlescent Black

BATTERIA ACUSTICA DW PDP X7 Pearlescent Black TEMPO LIMITATO DELL'OFFERTA: solo fino al 10 MAGGIO . OTTIMO AFFARE: 50% DEL VALORE NUOVO! Batteria acustica completa, comprata nuova (euro ). Ottime condizioni (pari al nuovo). Causa inutilizzo e trasferimento a breve in altra città vendesi a META' PREZZO! - 3 Tom; - 2 Timpani; - 1 Rullante; - 3 Piatti BSX (crash, ride, charleston); - 1 Cassa; - 1 Pedale; - 1 Reggirullante; - Tutte le aste necessarie Visione, pagamento e consegna a ROMA (zona Tuscolana). Solo se realmente interessati inviare un proprio contatto telefonico per ultimi chiarimenti e fissare in tempi brevi un appuntamento per la visione e conclusione della compravendita. Grazie! --- Other technical specification: Bass Drum(s): 22" x 18" Tom(s): 8" x 7", 10" x 8", 12" x 9" Floor Tom(s): 14" x " x 14" Snare: 14" x 5-1/2" Total Pieces: 7

Interactive Image Processing for Machine Vision

ISBN: , SKU: , AUTHOR: Batchelor, Bruce G. / Waltz, Frederick, PUBLISHER: Springer, Machine vision systems offer great potential in a large number of areas of manufacturing industry and are used principally for Automated Visual Inspection and Robot Vision. This publication presents the state of the art in image processing. It discusses techniques which have been developed for designing machines for use in industrial inspection and robot control, putting the emphasis on software and algorithms. A comprehensive set of image processing subroutines, which together form the basic vocabulary for the versatile image processing language IIPL, is presented. This language has proved to be extremely effective, working as a design tool, in solving numerous practical inspection problems. The merging of this language with Prolog provides an even more powerful facility which retains the benefits of human and machine intelligence. The authors bring together the practical experience and the picture material from a leading industrial research laboratory and the mathematical foundations necessary to understand and apply concepts in image processing. Interactive Image Processing is a self-contained reference book that can also be used in graduate level courses in electrical engineering, computer science and physics.

TECHNICAL SALES TO

Azienda leader nell'ambito delle tecnologie innovative e d’avanguardia che collabora con i più prestigiosi centri d'eccellenza mondiale, per potenziamento dell'ente tecnico - commerciale, ci ha richiesto di selezionare un profilo di TECHNICAL SALES La risorsa si occuperà di relazionarsi con i clienti, al fine di comprenderne le esigenze e di sviluppare un'offerta tecnico/economica adeguata al bisogno. In particolare, le sue attività saranno: - analisi delle richieste di offerte in arrivo via email e telefonicamente; - richieste di offerte ai fornitori per qualificare il costo dei materiali; - interfaccia con il Responsabile Tecnico/di Reparto per la previsione delle tempistiche di esecuzione di impianti o particolari; - analisi e ricerca di nuovi possibili mercati; - attività di marketing/partecipazione a fiere ed eventi nazionali ed internazionali. Per ricoprire con successo la posizione sono necessarie una pregressa esperienza in un ruolo analogo, la conoscenza del disegno tecnico e della meccanica. Viene inoltre richiesta una ottima conoscenza della lingua Inglese (parlata e scritta) e dei principali programmi informatici del pacchetto Office. Gradite la Laurea in Ingegneria, la conoscenza di una seconda lingua oltre all'Inglese e la conoscenza della suite Autodesk (Inventor/Autocad). Completano il profilo spiccate capacità relazionali, curiosità, proattività, passione nei confronti delle tecnologie innovative, attitudine al lavoro al team, flessibilità nell'adattarsi ai diversi interlocutori aziendali, disponibilità ad effettuare trasferte presso i clienti per brevi periodi e a partecipare a fiere internazionali di settore. Il/la candidato/a inserito/a nel team tecnico/commerciale, a diretto riporto della Direzione, potrà iniziare un percorso di crescita strutturato ad alto contenuto tecnico. Per candidature particolarmente brillanti e motivate si valutano anche profili di neo-laureati. L'inquadramento sarà commisurato all'esperienza pregressa e sarà in grado di soddisfare le candidature più qualificate. CCNL di riferimento: Metalmeccanico About Job è un'Agenzia di Ricerca e Selezione del Personale autorizzata dal Ministero del Lavoro al prot. 13/I/ che offre consulenze integrate nell'ambito della gestione delle Risorse Umane. I candidati sono invitati a leggere sul nostro sito aboutjob l'informativa sulla privacy (GDPR Regolamento UE ). Il presente annuncio è rivolto ad entrambi i sessi, ai sensi delle leggi e , e a persone di tutte le età e tutte le nazionalità, ai sensi dei decreti legislativi e .

PLANT PROCESS QUALITY ENGINEER

S&YOU, divisione Permanent di Synergie Italia, sede di TORINO, seleziona per importante azienda del automotive un/una: PLANT PROCESS QUALITY ENGINEER La risorsa dovrà garantire la qualità del prodotto finito secondo le specifiche del cliente, attraverso il monitoraggio e il controllo delle diverse fasi del processo produttivo. Il candidato ideale è in possesso di laurea in ingegneria o laurea tecnica equiparabile, ed ha maturato esperienza di almeno 2 anni in posizione similare all’interno di realtà multinazionali automotive modernamente strutturate. E’ fondamentale la conoscenza di: Del metodo 8D AA cycles Clients management Containment Control prescription H&S and Environmental management system standards and policies Interpretation of technical drawings Measurement system use MSA PPAP Reworking SPC Completa il profilo l’ottima conoscenza della lingua inglese. Si offre inserimento diretto in azienda con contratto da definire in base alle reali competenze del candidato Luogo di lavoro: Cintura sud di Torino

The the Next Level: What Insiders Know about Executive

ISBN: , SKU: , AUTHOR: Eblin, Scott, PUBLISHER: Nicholas Brealey Publishing, After the thrill of promotion to an executive position comes the sobering reality of just how difficult it is to succeed at this level-and how hard it can be to find help. Some 40 percent of new executives don't last 18 months. Why do so many employees with strong track records derail when promoted to the executive suite? In The Next Level, Scott Eblin draws on 20 years of experience as a leader and executive coach to identify why new executives fail, and offers a practical program for achieving success. Rising executives must understand that the strengths and actions that drove their career progress at lower levels-such as technical prowess-will not necessarily sustain their success as executives. They need to pick up new behaviors and beliefs, and, more important, let go of old ones.

Cardiac Safety of Noncardiac Drugs: Practical Guidelines for

ISBN: , SKU: , AUTHOR: Morganroth, Joel / Gussak, Ihor, PUBLISHER: Humana Press, Basic and clinical researchers from industry and academia detail the preclinical, clinical, and regulatory principles currently used to assess the cardiac safety of new drugs. The authors explain the parameters of cardiac safety at all stages of clinical research and drug development, including both the preclinical and pharmacogenomic aspects generally and the clinical methodologies and technical aspects for investigational drugs based on cardiac repolarization, as defined by the duration of the QTc interval. Additional chapters comprehensively review the application of electrocardiography in clinical research, the fundamentals of ECG interpretation in clinical trials, the statistical analysis plans for ECG data obtained in formal clinical trials, and the practical interpretation of the ECG results. Highlights include practical guidance on how to conduct a thorough ECG Trial in New Drug Development, how to use new ECG and web based technology in clinical research, and how to follow the new FDA requirements for ECG submissions.

Early Greek Warfare: Horsemen and Chariots in the Homeric

ISBN: , SKU: , AUTHOR: Greenhalgh, P. A. L. / Greenhalgh, PUBLISHER: Cambridge University Press, First published in , this is a study of the literary and archaeological developments in the warfare of early Greece. Dr Greenhalgh considers in particular the military history of the chariot and mounted horse, both as they were represented in poetry and art and as they were used in reality from about to 500BC. He finds the picture superficially presented by the sources incoherent and often incredible, and attempts a reconstruction which does justice to both tactical and technical possibilities and to the social and economic facts of life in the period. He shoes how the Homeric poems, for example, can be systematically misleading - in part misconceiving the character of the Mycenaean age, and in part conflating with this misconception the conditions of their own time. This illustrated study will be of value to archaeologists, historians of warfare and Homeric specialists; its wider implications will interest social and political historians.

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