TY  - BOOK
TI  - Lower Triassic ammonoids of North America
T2  - Geological Survey (U.S.). Geological Survey professional paper
AV  - QE75 .P9 no. 167
PY  - 1932///
CY  - Washington
PB  - U.S. Gov't. Print. Off.
KW  - Ammonoidea
KW  - Paleontology
KW  - North America
KW  - Triassic
N1  - At head of title: United States Department of the Interior; Bibliography: p. 4-6
ER  -