Douglas, Peter M J <br/><br/>
Drought, agricultural adaptation, and sociopolitical collapse in the Maya Lowlands.  [electronic resource] 

 -  Proceedings of the National Academy of Sciences of the United States of America  May 2015 
 - 5607-12 p.  digital 
<br/><br/> Publication Type: Historical Article; Journal Article; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, Non-P.H.S. 
<br/><br/><label>ISSN: </label>1091-6490 
<br/><br/><label>Standard No.: </label>10.1073/pnas.1419133112  doi 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Acclimatization<br/>Agriculture--history<br/>Civilization--history<br/>Climate<br/>Climate Change<br/>Droughts--history<br/>Ecosystem<br/>Environment<br/>Geography<br/>Geologic Sediments--analysis<br/>History, Ancient<br/>Humans<br/>Indians, South American--history<br/>Lipids--analysis<br/>Mexico<br/>Oxygen Isotopes<br/>Plants--chemistry<br/>Rain<br/>Time Factors<br/>Waxes--analysis