Philippines. Ecosystems Research and Development Bureau. (1989). Integrated research and development plans and programs of the Department of Environment and Natural Resources, 1989-1993. Department of Environment and Natural Resources, Ecosystems Research and Development Bureau.
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Citace podle MLA (9th ed.)Philippines. Ecosystems Research and Development Bureau. Integrated Research and Development Plans and Programs of the Department of Environment and Natural Resources, 1989-1993. Department of Environment and Natural Resources, Ecosystems Research and Development Bureau, 1989.