Soil and water conservation. Vegetation controls erosion. Dams and landscapes. Ecology and landscapes 1960
Proceedings and papers : sixth Technical Meeting held at Edinburgh in June, 1956 simultaneously with the Union's 5th General Assembly 1957
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 |
Proceedings and papers of the 5th technical meeting held at Copenhagen, 25 August to 3 September 1954 simultaneously with the Union's fourth General Assembly 1956
