PICTURE CREDITS
| 3: | Jim Richardson/Corbis |
| 8: | North Wind Picture Archive |
| 11: | Smithsonian American Art Museum, Washington, DC/Art Resource, NY |
| 12: | North Wind Picture Archive |
| 14: | Bettmann/Corbis |
| 16–17: | Smithsonian American Art Museum, Washington, DC/Art Resource, NY |
| 18: | Smithsonian American Art Museum, Washington, DC/Art Resource, NY |
| 22: | North Wind Picture Archives |
| 24: | © Collection Viollet, Blérancourt, French-American Museum |
| 26: | Hulton/Archive |
| 28: | Hulton/Archive |
| 30: | David Samuel Robbins/Corbis |
| 33: | Lowell Georgia/Corbis |
| 34: | Lowell Georgia/Corbis |
| 38: | Michael S.Yamashita/Corbis |
| 41: | Hulton/Archive |
| 42: | Smithsonian American Art Museum, Washington, DC/Art Resource, NY |
| 46: | Biblioteca Nazionale, Florence, Italy |
| 49: | Vadim Petrakov/Shutterstock.com |
| 51: | used under license from Shutterstock, Inc. |
| 52: | used under license from Shutterstock, Inc. |