Some problems of wildlife conservation in the USSR
1978
IUCN
Ecological guidelines for development in tropical rain forests
1976
Poore, Duncan |
Ecological principles for economic development
1973
Dasmann, Raymond Fredric |
Milton, John P. |
Freeman, Peter H. |
L'Agonia della terra
1974
Pavan, Mario |
The international trade in rhinoceros products : a report
1979
Martin, Esmond Bradley |
