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Soil Survey
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Technical References
Soil Survey Manuscripts (historical and current)
Soil Survey Investigation Reports (historical and current)
History of Soil Survey
Historical Soil Classification Documents
Soil Conservation Survey Handbook (1939; PDF; 7.22 MB)
“A Digital Collection of Selected Historical Publications on Soil Survey and Soil Classification in the United States of America”
Soils Planners – links to planners from 1999 to present
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