00644cam a2200169 a 4500 9715600328 AGL 471 SEA 1999 A023 Co. Utilization and protection of degraded Philippine uplands : technologies and management systems. Los Ba�nos, Laguna, Philippines : SEAMEO Regional Center for Graduate Study and Research in Agriculture, c1999. i, 39 p. : ill. ; 28 cm. Sustainable agriculture Sustainable forestry Soil protection SEAMEO Regional Center for Graduate Study and Research in Agriculture. EK 13846 13846