Heizer, Robert F., 1960
"Agriculture and the theocratic state in lowland Southeastern Mexico," American Antiquity. 23(2):215-222. [428] notebook

Discusses the productivity of milpa agriculture in general and in the La Venta area. Argues that the population supported by this agricultural technology would have been sufficient to build and rebuild the structures at La Venta. Contains detailed calculations of labor required and labor available. Does not mention earlier calculations of the same kind for later sites (Cook, 1947). Clearly written, good background material provided.