Image of transit and equal altitude instrument: Courtesy of National Museum of American History, Smithsonian Institution 74-1401
Image of telescope and level: Independence National Historical Park Collection, Philadelphia, PA, (INDE cat. #11891). Sally M. Walker, photographer.
Diagram of the quest for the Tangent Line: Courtesy of Jack Owens. Redrawn by Karen Minot
Close-up of the Tangent Point: Courtesy of the Library of Congress
Image of McClean’s account book: Courtesy of the Historical Society of Pennsylvania (Account Book of the Commissioners (1764–1766), Chew Family Papers Collection 2050)
Chapter 9
Image of stamp: Courtesy of the Library of Congress
Image of stamp parody: Courtesy of the Library of Congress
Close-up of the West Line: Courtesy of the Library of Congress
Images of crown stones: Courtesy of the Maryland Historical Society (PP37-7-1-b)
Chapter 10
Close-up of topography on map: Courtesy of the Library of Congress
Image of ambush on Braddock’s army: Courtesy of the Library of Congress
Image of hickory leaf: Courtesy of the Library Company of Philadelphia
Chapter 11
Image of Shelton pendulum clock: © The Royal Society
Mason and Dixon’s 1767 letter: Courtesy of the Historical Society of Pennsylvania (Correspondence — Charles Mason and Jeremiah Dixon to Benjamin Chew, Chew Family Papers Collection 2050)
Image of McClean’s account book: Courtesy of the Historical Society of Pennsylvania (Account Book of the Commissioners (1764–1768), Chew Family Papers Collection 2050)
Close-up of War Path on map: Courtesy of the Library of Congress
Map of a degree of latitude: © The Royal Society
Image of Jeremiah Dixon’s map: Courtesy of the Maryland Historical Society (MS174.1051)
Image of invoice: Courtesy of the Historical Society of Pennsylvania (Accounts — Charles Mason and Jeremiah Dixon (1763–1768), Chew Family Papers Collection 2050)
Chapter 12
Image of William Parker’s house: Courtesy of the Historical Society of Pennsylvania (The “Christiana Riot” House, HSP Photograph collection V59)
Image of Frederick Douglass: Courtesy of the Art Institute of Chicago
Image of Harriet Tubman: Courtesy of Founders Library-Northern Illinois University
Cartoon: Courtesy of Archives and Special Collections, Dickinson College, Carlisle, PA
Chapter 13
Image of family with boundary stone: Courtesy of the Maryland Historical Society (PP37-3-8)
Image of lady standing on boundary stone: Courtesy of the Maryland Histocial Society (PP37-3-5)
Image of crown stone 100: Courtesy of the Maryland Historical Society (PP37-10-6)
Image of marker as part of concrete step: Courtesy of Todd Babcock
All other photographs are courtesy of Sally M. Walker
Copyright © 2014 by Sally M. Walker
Cover photographs: courtesy the National Archives (journal pages);
Library of Congress (map details);
Historical Society of Pennsylvania (signatures, letter and invoice excerpts);
Library of Congress of Philadelphia (William Penn);
New Hampshire Historical Society (chain)
Map and diagram illustration copyright © 2014 by Karen Minot
Photography credits appear here.
All rights reserved. No part of this book may be reproduced, transmitted, or stored in an information retrieval system in any form or by any means, graphic, electronic, or mechanical, including photocopying, taping, and recording, without prior written permission from the publisher.
First electronic edition 2014
Library of Congress Catalog Card Number 2013946612
ISBN 978-0-7636-5612-6 (hardcover)
ISBN 978-0-7636-7036-8 (electronic)
Candlewick Press
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Somerville, Massachusetts 02144
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Boundaries Page 17