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Vitosh, M.L. ;Johnson, J.W. ;Mengel, D.G. 1995. “Tri-state Fertilizer Recommendations for Corn, Soybean, Wheat, and Alfalfa”
Harris, C.K. ;Molnar, J. ;Tomazic, T. ;Wimberley, R. 2002. “The Social Risks of Agriculture: Americans Speak Out on Food”
Michener, W. K. ;Brunt, J. W. 2000. “Ecological Data: Design, Management, and Processing” : 180 pages.
Scriber, J.M. ;Tsubaki, Y. ;Lederhouse, R.C. 1995. “The Swallowtail Butterflies: Their Ecology and Evolutionary Biology”
Robertson, G.P. ;Bledsoe, C.S. ;Coleman, D.C. ;Sollins, P. 1999. “Standard Soil Methods for Long-Term Ecological Research” : 462.
Probyn, L. K. ;Cavigelli, M. A. ;Mutch, D. R. 2000. “Michigan Field Crop Pest Ecology and Management” : 102.
Paul, E.A. ;Paustian, K. ;Elliott, E.T. ;Cole, C.V. 1997. “Soil Organic Matter in Temperate Ecosystems: Long-Term Experiments in North America” : 500.
Cavigelli, M.A. ;Deming, S.R. ;Probyn, L.K. ;Harwood, R.R. 1998. “Michigan Field Crop Ecology: Managing Biological Processes for Productivity and Environmental Quality” : 92.
Collins, H.P. ;Robertson, G.P. ;Klug, M.J. 1995. “The Significance and Regulation of Soil Biodiversity” : 239.