Soil erosion assessment in terrace land using WOCAT SLM (sustainable land management) method a case study in selopamioro upland and Sultan ground, Imogiri Sub Distric, Bantul Regency, Special Province of Yogyakarta - , WINARNA, Nugraha Wahyu; , Dr. H.A. Sudibyakto, M.S ([Yogyakarta] : Universitas Gadjah Mada, 2009)