This archival publication may not reflect current scientific knowledge or recommendations. Current information available from the University of Minnesota Extension: https://www.extension.umn.edu.
Fenster, William E.; Overdahl, Curtis J.; Simkins, Charles A.; Grava, John.
Guide to computer programmed soil test recommendations in Minnesota 1971.
University of Minnesota. Agricultural Extension Service.
Retrieved from the University of Minnesota Digital Conservancy,
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