RT Journal Article SR Electronic T1 The past, present, and future of prairie potholes in the United States JF Journal of Soil and Water Conservation FD Soil and Water Conservation Society SP 84A OP 87A DO 10.2489/jswc.63.3.84A VO 63 IS 3 A1 Rex R. Johnson A1 Fred T. Oslund A1 Dan R. Hertel YR 2008 UL http://www.jswconline.org/content/63/3/84A.abstract AB