RT Journal Article SR Electronic T1 Assessing the quality of rangeland soils: Challenges and opportunities JF Journal of Soil and Water Conservation FD Soil and Water Conservation Society SP 237 OP 242 VO 50 IS 3 A1 Jeffrey E. Herrick A1 Walter G. Whitford YR 1995 UL http://www.jswconline.org/content/50/3/237.abstract AB