A

Abler, Bill, 213-214

Academy of Natural Sciences (Philadelphia), 37

Adult animal, defining, 168 Age of dinosaurs, 125

The Age of Reptiles, 86 Albertosaurus, 131, 132, 138, 158 Alectrosaurus, 131, 132 Alectrosaurus olseni, 133

Alexander, R. McNeill, 194, 196, 198

Alioramus remotus, 133 Allosaurus, 83, 138

American Museum of Natural History, 30, 57 Anagensis, 139

Anatotitian, 165

Ancell, Carrie, 37 Andrews, Roy Chapman, 41 Animal behavior and ecology, 17

Apatosaurus, 81

Arms of Tyrannosaurus rex, 113-116 Army Corps of Engineers, 39, 53, 54 Artists' representations of Tyrannosaurus rex, 85-88

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