1. Ambrose, S. H., Emergent Horticultural Economies of the Eastern Woodlands: 87 (1987).
2. Anderson, E., Man's Role in Changinig the Face of the Earth: 763 (1956).
3. Asch, D., UNIVERSITY OF MICHIGAN MUSEUM OF ANTHROPOLOGY ANTHROPOLOGICAL PAPERS 75: 149 (1985).
4. BENDER, M.M., FURTHER LIGHT ON CARBON ISOTOPES AND HOPEWELL AGRICULTURE, AMERICAN ANTIQUITY 46: 346 (1981).
5. BRAUN, D.P., EMERGENT HORTICULTUR: 153 (1987).