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1.- AN ARIDIFICATION EVENT BEGINNING ABOUT 1600 AD IN CENTRAL AMERICA; EVIDENCE FROM A LAKE SEDIMENT CORE IN LAGUNA ZONCHO, COSTA RICA AND EFFECTS ON AGRICULTURE AND POPULATION
GEOLOGICAL SOCIETY OF AMERICA (GSA); BOULDER, CO; USA; UNITED STATES, 2003
GEOLOGICAL SOCIETY OF AMERICA, 2003 ANNUAL MEETING
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2.- THE IMPACT OF CLIMATE AND PRE-COLUMBIAN AGRICULTURE ON SOIL AND NUTRIENTS IN SOUTHWESTERN COSTA RICA
[INTERNATIONAL UNION FOR QUATERNARY RESEARCH];; III; INTERNATIONAL, 2003
XVI INQUA CONGRESS; SHAPING THE EARTH; A QUATERNARY PERSPECTIVE
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