@article{416924, recid = {416924}, author = {Hassan, Fekri A.}, title = {Droughts, food, and culture ecological change and food security in Africa's later prehistory / [electronic resource] :}, publisher = {Kluwer Academic/Plenum Publishers,}, address = {New York :}, pages = {xvii, 347 p. :}, year = {2002}, url = {http://library.usi.edu/record/416924}, }