Thirteenth Technical Meeting, Kinshasa, Zaire, 8-17 September 1975 : papers
1975
IUCN
Proceedings : International Conference on the Conservation of Wetlands and Waterfowl, Ramsar, Iran, 30 January - 3 February 1971
1972
Carp, Erik |
Project aqua : a source book of inland waters proposed for conservation
1971
Luther, H. |
Rzóska, J. |
Worthington, E. B. |
Interférences de l'homme sur la nature : les équilibres biologiques. Appel aux jeunes gens
1968
Pavan, Mario |
