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1.- SOIL ANALYSES TO IDENTIFY ANCIENT HUMAN ACTIVITIES
AGRICULTURAL INSTITUTE OF CANADA; OTTAWA, ON; CAN; CANADA, 1996
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2.- THE IMPACT OF CLIMATIC CHANGE ON PAST CIVILIZATIONS; A REVISIONIST AGENDA FOR FURTHER INVESTIGATION
PERGAMON; OXFORD; GBR; UNITED KINGDOM, 1997
CLIMATIC CHANGE; MEXICO
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