Person Mathias RitterMathias Ritter bei Heinrich-Barth-Inst. Proceedings of the Third International Conference on the Archaeology of the Fourth Nile CataractUniversity of cologne, 13-14 July 2006Mathias RitterHeinrich-Barth-Inst.Buch201248,00 € Aridity, Change and Conflict in AfricaProceedings of an International ACACIA Conference held at Königswinter, Germany, October 1-3, 2003Fayez AlailyHeinrich-Barth-Inst.Softcover200729,00 € Atlas of Cultural and Environmental Change in Arid Africa Marianne Bechhaus-GerstHeinrich-Barth-Inst.Hardcover200745,00 €