Biology, conservation and management of waterfowl in Venezuela
1990
Gomez-Dallmeier, Francisco |
Cringan, Alexander T. |
Protected areas
Managing the environmental crisis : incorporating competing values in natural resource administration
1989
Henning, Daniel H. |
Mangun, William R. |
Caldwell, Lynton K. |
Nature reserves : island theory and conservation practice
1990
Shafer, Craig L. |
Servicio de parques nacionales areas silvestres de Nicaragua (primer borrador)
1983
Dilger F., R. |
Areas prioritarias para la conservación en la Región Oriental del Paraguay
1990
Acevedo, Celeste |
A selection of unpublished WWF project reports
1990
Stone, R. David |
Friends of the National Parks : a report on friends group throughout the National Park System
1993
Machlis, Gary E. |
Medlin, Nancy C. |
For the conservation of the Earth
1988
Martin, Vance |