The Fly river catchment Papua New Guinea : a regional environmental assessment
1993
Watling, Dick |
Wood, Stephen G. |
Wetlands
Wetlands in Africa : a review of conservation and development issues
1991
Dugan, Patrick |
The IUCN review of the Southern Okavango integrated water development project : final report
1993
Coley, R. W. |
Manley, Ronald E. |
Scudder, Thayer |