Animal exploitation between the fifth and the sixth cataract ca. 8500-7000 B.P. A preliminary report on the faunas from el-Damer, Abu Darbein and Aneibis - Peters, J. (Environmental change and human culture in the Nile Basin and Northern Africa until the second millennium B.C. Proceedings of the international symposium, Dymaczewo near Poznań 5-10 September 1988)