Lower Triassic ammonoids of North America /

Lower Triassic ammonoids of North America / by James Perrin Smith. - Washington : U.S. Gov't. Print. Off., 1932. - v, 199 p. : ill., map, 81 plates ; 29 cm. - Geological Survey (U.S.). Geological Survey professional paper ; no. 167 . - Geological Survey professional paper ; no. 167. .

At head of title: United States Department of the Interior.

Bibliography: p. 4-6.

gs 32000180


Ammonoidea.
Paleontology--North America.
Paleontology--Triassic.

QE75 / .P9 no. 167

I 19.16:167

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