Review of: "The Iowa Geological Survey, Volume 3, Second Annual Report, 1893" by Samuel Calvin, Charles Rollin Keyes, and G. E. Patrick.
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.
"The Iowa Geological Survey." The Annals of Iowa 2 (1895), 76-77.
Available at: https://ir.uiowa.edu/annals-of-iowa/vol2/iss1/13