References
- Bogli, A. 1980. Karst hydrology and physical speleology, Berlin, Springer
- Palmquist, R. C. 1965. Geomorphic Development of Part of the Driftless Area, Southwest Wisconsin. University of Wisconsin, Ph.D Thesis, 182p
- Trowbridge, A. C. 1921. The erosional history of the Driftless Area. University of Iowa, Studies in Natural History, 9, 7-127