Protected areas of the world : a review of national systems.
IUCN Conservation Monitoring Centre.
British Petroleum Company.
IUCN Commission on National Parks and Protected Areas.
World Congress on National Parks and Protected Areas(4th :1992 :Caracus, Venezuela)
Gland, Switzerland  : IUCN,
1991.
Includes bibliographical references
Nature conservation
Nature conservation
Nature conservation
Nature conservation