Brown, Roland W. <br/><br/>
Cretaceous plant from southwestern Colorado 

 - Washington, D.C.  U.S. Geological Survey  1950 
 - pp. 45-66  láms. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>CRETACEO<br/>PALEOBOTANICA
<br/><br/><label>Subjects--Geographic Terms: </label><br/>ESTADOS UNIDOS