TY  - BOOK
AU  - Knowlton,Frank Hall
TI  - The Laramie flora of the Denver basin,: with a review of the Laramie problem,
T2  - U.S. Geological survey. Professional paper l30
PY  - 1922///
CY  - Washington
PB  - Govt. print. off.
KW  - Paleobotany
KW  - Geology, Stratigraphic
KW  - Cretaceous
N1  - At head of title: Department of the interior
ER  -