Material in the public domain. No restrictions on use.
Creative Commons License
This work has been identified with a Creative Commons Public Domain Mark 1.0.
Stookey, S. W.
"Geology of Poweshiek County,"
Iowa Geological Survey Annual Report:
Vol. 20: p. 237-270.
Available at: http://ir.uiowa.edu/igsar/vol20/iss1/8