AUTHOR
- Simon, Noel 2 tulosta
- Bowles, Marlin J. 1 tulosta
- Burton, John A., 1931- 1 tulosta
- Dahl, Arthur L. 1 tulosta
- Gale Research Inc 1 tulosta
- International Union for Conservation of Nature and natural resources Commission on National Parks and Protected Areas 1 tulosta
- Wilson, Edward O. 1 tulosta
- World Conservation Monitoring Centre, Cambridge 1 tulosta