The Laramie flora of the Denver basin, with a review of the Laramie problem,
Knowlton, Frank Hall, 1860-1926.
The Laramie flora of the Denver basin, with a review of the Laramie problem, by F. H. Knowlton. - Washington, Govt. print. off., 1922. - iv, 175 p. XXVIII pl., tables. 29 cm. - U.S. Geological survey. Professional paper l30 .
At head of title: Department of the interior.
gs 22000387
Paleobotany.
Geology, Stratigraphic--Cretaceous.
The Laramie flora of the Denver basin, with a review of the Laramie problem, by F. H. Knowlton. - Washington, Govt. print. off., 1922. - iv, 175 p. XXVIII pl., tables. 29 cm. - U.S. Geological survey. Professional paper l30 .
At head of title: Department of the interior.
gs 22000387
Paleobotany.
Geology, Stratigraphic--Cretaceous.