RT Journal Article SR Electronic T1 The Area IV Soil Conservation Districts Cooperative Research Farm: Thirty years of collaborative research to improve cropping system sustainability in the Northern Plains JF Journal of Soil and Water Conservation FD Soil and Water Conservation Society SP 99A OP 103A DO 10.2489/jswc.69.4.99A VO 69 IS 4 A1 Mark Liebig A1 David Archer A1 John Hendrickson A1 Kristine Nichols A1 Matt Sanderson A1 Don Tanaka A1 Steve Merrill A1 LeAnn Harner A1 Duane Olsen YR 2014 UL http://www.jswconline.org/content/69/4/99A.abstract AB