Soil conservation
Les techniques de conservation des eaux et des sols dans les pays du Sahel
1992
Vlaar, J. C. J. |
Report on legal and institutional frameworks on sustainable soils
2001
Hannam, Ian |
Designing an optimum protected areas system for Sri Lanka's natural forests
1997
Green, Michael John Beverley |
Gunawardena, E. |
Evaluation of sustainable development activities [period January 1992 to September 1995] : Mount Elgon conservation and development project
1996
Hoefsloot, Henk |
Conservation review of some natural forests in Sri Lanka
1993
Green, Michael John Beverley |
Gunawardena, E. |