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Supertopics:
Soil Degradation Miscellany
Resource Depletion as Cause of Collapse, through 2007
History of Agriculture

conquest of the land over 7000 years      web

webhttp://nrcspad.sc.egov.usda.gov/DistributionCenter/pdf.aspx?productID=109
authorW. C. Lowdermilk
publicationUSDA
date1953-08-01

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