Towards a new relationship of man and nature in temperate lands. Part III. Changes due to introduced species
1967
Conservation
Conservation of nature and natural resources in modern African states : report of a symposium
1963
Watterson, Gerald G. |
Harmonies universelles
1962
Baer, Jean G. |
Heim, Roger |
Conférence internationale pour la protection de la nature, Brunnen, 28 juin - 3 juillet 1947 : procès-verbaux, résolutions et rapports
1947
Büttikofer, Johann |
L'Agonia della terra
1974
Pavan, Mario |
Regional ecosystems survey of the South Pacific area
1980
Dahl, Arthur L. |