1. Center for International Earth Science Information Network (CIESIN); The Earth Institute at Columbia University; PO Box 1000 Palisades NY 10964 USA
2. Department of Geosciences; Williams College; Williamstown MA 01267 USA
3. USAID/Washington, Bureau for Africa; Washington DC 20009 USA
4. USAID/Senegal, Sahel Regional Office (SRO); Dakar Senegal