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ECONOMIC AND ENVIRONMENTAL BENEFITS OF SOIL/WATER NITROGEN TESTING: THE CASE OF CENTRAL NEBRASKA
Kim, C.S., (1999)
REGIONAL CHANGES IN THE DISTRIBUTION OF NET VALUE ADDED IN U.S. AGRICULTURE, 1960-2002
Erickson, Kenneth W., (2004)
CHANGES IN THE DISTRIBUTION OF FARM WEALTH IN THE UNITED STATES
Mishra, Ashok K., (2001)