5IUCN. 1980. 1980 United Nations tist of national parks and equivalent reserves. IUCN, Gland, Switzerland, 121 pp.
6National Park Service. 1980. Human impact on natu- ral resources. Proceedings of the Second Conference on Scien- tific Research in the National Parks. U.S. Department of the Interior, National Park Service. 386 pp.
7The Legal Philosophies of Lask, Radbruch and Dabin, pp. 463.
