Descripció
Descripció de l’ítem:"Proceedings of a conference sponsored and organized by the National Parks Centennial Commission of the United States of America; the National Park Service of the U.S. Department of the Interior; and the International Union for Conservation of Nature and Natural Resources. Cosponsors: United Nations Educational, Scientific, and Cultural Organization; Food and Agriculture Organization of the United Nations; and Natural Resources Council of America."
Descripció física:504 p. illus. 26 cm.
Bibliografia:Includes bibliographies.