Knowlton, F. H. <br/><br/>
Revision of the flora of the green river formation with descriptions of New Species. 

 - Washington  Government Printing Office  1923 
 - pp. 133-182 
<br/><br/> Impreso 
<br/><br/><br/>Ingles 
<br/><br/><label>Subjects--Topical Terms: </label><br/>MINERIA