Front cover image for World heritage twenty years later : based on papers presented at the World Heritage and other workshops held during the ivth world congress on national parks and protected areas, Caracas, Venezuela, February 1992

World heritage twenty years later : based on papers presented at the World Heritage and other workshops held during the ivth world congress on national parks and protected areas, Caracas, Venezuela, February 1992

Print Book, Undefined, 1997
International Union for Conservation of Nature and Natural Resources, Gland, Switzerland, 1997