1. Burkart, M.R. 1976 Pollen Biostratigraphy and Late Quaternary Vegetation History of the Bighorn Mountains, Wyoming. Unpublished Ph.D. dissertation, Department of Geology, University of Iowa, Iowa City.
2. Collins, Michael B. 1991 Occurrence of Folsom-Midland Components in Rockshelters in the South-Central United States. Paper presented at the 56th Annual Meeting of the Society for American Archaeology, New Orleans.