Berry, E W <br/><br/>
The Age and Affinities of the Tertiary Flora of Western Canada.  [electronic resource] 

 -  Proceedings of the National Academy of Sciences of the United States of America  Nov 1925 
 - 671-3 p.  digital 
<br/><br/> Publication Type: Journal Article 
<br/><br/><label>ISSN: </label>0027-8424 
<br/><br/><label>Standard No.: </label>10.1073/pnas.11.11.671  doi