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American Museum of Natural History: p. 29, 45 (left), 66; Des Bartlett, © National Geographic Society: 71 (top); David Brilclass="underline"
12, 17 141, 147; Bobbie Brown: 150, 151, 233 (left); Bob Camp-bell, © National Geographic Society: 104; Cleveland Museum of Natural History: 19, 44 (right), 215; Ives Coppens: 90; Luba Dmyt-ryk: 27, 35, 39, 47, 49, 71 (bottom), 77, 117 (middle), 117 (bottom), 132, 136, 137, 193–201, 236; Gerry Eck, 87; Gordon W. Ga-han, © National Geographic Society: 106; Tom Gray: 168; Melville Bell Grosvenor, ©National Geographic Society: 67; John Gurche: 53, 235, 238, 239; F. Herholdt: 45 (right); Donald C. Jo-hanson: 15, 117 (top), 159, 164, 257, 261; Peter Jones: 181, 183;
C. Owen Lovejoy: 246, 247; Jay Matternes: 212, 213, 263–265;
Steve Misencik: 74, 97, 144, 152, 171, 176, 205, 208–210; David Pilbeam: 270; Rheinisches Landesmuseum, Bonn: 44 (left); Larry Rubins: 259; University of California Press, Geology of the Oldu-vai Gorge: 69; Hank Wesselman: 91; Tim White: 222; Rob Wood:
229, 232, 233 (right), 242.
Color Section:
David Brilclass="underline" 2, 4–9, 11; Michael Bush: 14; Cleveland Museum of Natural History: 15; Donald C. Johanson: 1, 3; Jay Matternes: 10;
John Reader: 13; Tim White: 12.