For the relative importance of various productive activities see 433.
Outline of Cultural Materials. George P. Murdock, et al., eds. New Haven, Conn. Human Relations Area Files, Inc. 1961. xxv, 164 p.
The Neolithic civilization, marked by a shift from food gathering to food production through the raising of cultivated plants and domesticated animals, made its appearance independently in two widely separated parts of the continent—Egypt and the western Sudan.
George Murdock. Africa. Its Peoples and Their Culture History