Lower Triassic ammonoids of North America text dcu Washington U.S. Gov't. Print. Off. 1932 monographic eng
print
v, 199 p. : ill., map, 81 plates ; 29 cm. by James Perrin Smith. At head of title: United States Department of the Interior. Bibliography: p. 4-6. Ammonoidea Paleontology North America Paleontology Triassic QE75 .P9 no. 167 I 19.16:167 I 19.16:167 Geological Survey professional paper ; no. 167 gs 32000180 DLC 790402 20260227111336.0 gs 32000180