Biodiversity country studies : synthesis report
1992
UNEP
Transport of carbon and minerals in major world rivers, part 2 : proceedings of a workshop
1983
Degens, Egon T. |
Kempe, Stephan |
Soliman, Hassan |
Transport of carbon and minerals in major world rivers, part 1 : proceedings of a workshop
1982
Degens, Egon T. |
Estado de conservación de la fauna silvestre del cono sur sudamericano
1994
Iriarte Walton, Agustin |
Habitat diversity : Egypt
1993
Ayyad, Mohamed A. |
Kassas, Mohammed |
Springuel, I. |
Zahran, M. |
Elements for a new health strategy in third world countries
1979
Sigal, Silvia |
Trade and sustainable development
1994
Repetto, Robert C. |
Manual para la interpretacion ambiental en areas silvestres protegidas
1992
Morales Miranda, Jorge |