1. Beaubien, P. L., American Antiquity 19: 56 (1953).
2. University of Michigan Radiocarbon Dates I
3. Bur. Am. Ethnol. Bull. 1952 153 La Venta Tabasco: A Study of Olmec Ceramics and Art
4. EULER, R. C., PROCEEDINGS OF THE AMERICAN PHILOSOPHICAL SOCIETY 100: 87 (1956).
5. Anthropol. Papers Am. Museum Nat. History 1956 46 Poverty Point a Late Archaic Site in Louisiana