1. Archaeology Program, National Science Foundation, Arlington, VA 22230, USA.
2. Department of Anthropology, George Washington University, Washington, DC 20052, USA.
3. Musée Royal de l'Afrique Centrale, Section de Prehistoire, Tervuren, B-3080, Belgium.
4. Library, University of California, Santa Cruz, CA 95064, USA.
5. Canadian Museum of Nature, Research Division, Ottawa, Ontario, K1 P 6P4, Canada.