1. Tobacco Seeds in the Archaeobotanical Collections of the Center for American Archaeology;Asch,1991
2. Aboriginal specialty-plant cultivation in eastern North America: Illinois prehistory and a post-contact perspective;Asch,1994
3. Prehistoric plant cultivation in West-Central Illinois;Asch,1985
4. V. Bohrer, Flotation analysis from High Rolls Cave (LA 114103) Otero County New Mexico, Southwest Ethnobotanical Enterprises Report 39, 2004.
5. Man, culture, and hallucinogens: an overview;Dobkin de Rios,1975