Soil and water conservation. Natural aquatic resources
1959
IUCN
Report on a survey of the rhinoceros area of Nepal, March and April 1959
1959
Gee, E. P. |
Nature protection throughout the world : dedicated to the memory of Dr. Hugo Salomón
1957
Dennler de la Tour, Georges |
Wildlife preservation in semi-arid areas : papers presented at the third Technical Meeting of the International Union for Conservation of Nature and Natural Resources, Caracas 1952
1958
Villiers, A. |
Harroy, Jean-Paul |
