The flora of the Denver and associated formations of Colorado - Knowlton, Frank Hall, 1860-1926.; Berry, Edward Wilber, 1875-1945. (Washington : U.S. Gov't. Print. Off., 1930)
At head of title: United States Department of the Interior.
Includes bibliographical references.
Keywords: Paleobotany -- Colorado; Paleontology -- Cretaceous; Paleontology -- Tertiary