TY - BOOK ED - Food and Agriculture Organization of the United Nations ED - Unesco ED - United Nations Environment Programme TI - Tropical grazing land ecosystems: a state-of-knowledge report U1 - 574.5 PY - 1979/// CY - Paris PB - Unesco KW - Rangelands KW - Tropics KW - Range ecology KW - Range management KW - Grazing KW - Human ecology ER -