National parks for a new generation: visions, realities, prospects

by 6225 Conservation Foundation, Washington, D.C. (EUA)
Published 1985

Agriculture and the environment in a changing world economy Agriculture and the environment in a changing world economy

by 6225 Conservation Foundation, Washington, D.C. (EUA)
Published 1986

Desarrollo socioeconómico y el ambiente natural de Costa Rica: situación actual y perspectivas

by 109009 Ramírez S, A., 89715 Maldonado U, T., 6225 Conservation Foundation, Washington, D.C. (EUA)
Published 1988

Ecological principles for economic development Ecological principles for economic development

by 61285 Dasmann, R.F., 94390 Milton, J.P., 69019 Freeman, P.H., 18565 UICN, Gland (Suiza), 6225 Conservation Foundation, Washington, D.C. (EUA)
Published c197