“…(j) Research on the effects of soil erosion on the recreational value of land using the travel cost method (Feather and Hellerstein, 1997;Hellerstein, 1998;Hansen et al, 1999;Feather et al, 1999). (k) Cost benefit analyses (CBA), such as those of Graaf (1994) and Araya and Asafu-Adjaye (1999), building on the pioneer work of Seitz et al (1979) to measure the impact of erosion control techniques. (l) The most recent approaches, using stated preference techniques, such as contingent valuation, choice experiments and contingent ranking.…”