Knowlton, Frank Hall,  1860-1926. <br/><br/>
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 .
<br/><br/> At head of title: Department of the interior. 
<br/><br/><label>LCCN: </label>gs 22000387  
<br/><br/><label>Subjects--Topical Terms: </label><br/>Paleobotany.<br/>Geology, Stratigraphic--Cretaceous.