Nelson, David M <br/><br/>
Response of C3 and C4 plants to middle-Holocene climatic variation near the prairie-forest ecotone of Minnesota.  [electronic resource] 

 -  Proceedings of the National Academy of Sciences of the United States of America  Jan 2004 
 - 562-7 p.  digital 
<br/><br/> Publication Type: Journal Article; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, Non-P.H.S. 
<br/><br/><label>ISSN: </label>0027-8424 
<br/><br/><label>Standard No.: </label>10.1073/pnas.0307450100  doi 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Climate<br/>Ecosystem<br/>Minnesota<br/>Plant Physiological Phenomena