RT Journal Article SR Electronic T1 Badland and gully erosion in the Karoo, South Africa JF Journal of Soil and Water Conservation FD Soil and Water Conservation Society SP 121A OP 125A DO 10.2489/jswc.63.4.121A VO 63 IS 4 A1 John Boardman A1 Ian Foster YR 2008 UL http://www.jswconline.org/content/63/4/121A.abstract AB