Berry, E W <br/><br/>
Upper Cretaceous Floras of the World.  [electronic resource] 

 -  Proceedings of the National Academy of Sciences of the United States of America  Mar 1916 
 - 186-7 p.  digital 
<br/><br/> Publication Type: Journal Article 
<br/><br/><label>ISSN: </label>0027-8424 
<br/><br/><label>Standard No.: </label>10.1073/pnas.2.3.186  doi