Clark, John Desmond The spread of food production in sub-Saharan Africa / J. Desmond Clark - Vol. 1, p. 3-13 : carte ; 22 cm Bibliogr. p. 11-13 Subjects--Topical Terms: AGRICULTUREETUDE ECONOMIQUEPRODUCTION AGRICOLEALIMENTATION Subjects--Geographic Terms: AFRIQUE SUBSAHARIENNE Dewey Class. No.: 338.1967