Minnesota Pollution Control Agency and USDA Natural Resources Conservation Service. 2002. Applying manure in sensitive areas (.pdf). 12 pp.
A guide for livestock producers and agricultural professionals.
Randall, G., M. Schmitt, J. Strock, and J. Lamb. 2003. Validating N rates for corn on farm fields in southern Minnesota. University of Minnesota Extension bulletin BU-07936-S.
University of Minnesota Extension. 2004. Field record for Minnesota farms. A 110-page pocket record book for recording field operations.
University of Minnesota Water Resources Center and University of Minnesota Extension. 2008. Feasibility of an On-Farm Water Quality Program in Minnesota (.pdf). St. Paul, MN. 49 pp.