Catalogue of conservation practices for agriculture on sloping land / Gomez, Arturo A. Kelly, David E. Swete. Baril, Ma. Theresa A. SEAMEO Regional Center for Graduate Study and Research in Agriculture. Hill farming Agricultural conservation 631 SEA 1998 A091 Or. College, Laguna, Philippines ; SEARCA, 1998. 1998. Text x, 158 p. :