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Topics:
Soil Degradation through 2017
Resource Depletion as Cause of Collapse, through 2007
Agricultural History, Articles through 2014
conquest of the land over 7000 years
web
web
http://nrcspad.sc.egov.usda.gov/DistributionCenter/pdf.aspx?productID=109
author
W. C. Lowdermilk
publication
USDA
date
1953-08-01
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