RT Journal Article SR Electronic T1 Economic values and incentives affecting soil and water conservation in developing countries JF Journal of Soil and Water Conservation FD Soil and Water Conservation Society SP 133 OP 137 VO 50 IS 2 A1 Edward B. Barbier A1 Joshua T. Bishop YR 1995 UL http://www.jswconline.org/content/50/2/133.abstract AB