The twenty-ninth day : accomodating human needs and numbers to the earth's resources 1978 Brown, Lester R. (Lester Russell) |
Conservation of natural resources and the establishment of reserves in the USSR 1961 Dubinin, V. B. | Lavrenko, E. M. | Kirikov, S. V. |
Protection et conservation des richesses naturelles de la Corse Bourlière, François | Dorst, Jean | Hoffmann, Lukas | Molinier, Roger | Pfeffer, Pierre | Terrasse, Jean François |