Evidence was presented that The Hertha extends further east than has heretofore been reported.
Proceedings of the Iowa Academy of Science
©1929 Iowa Academy of Science, Inc.
"The Eastern Margin of the Hertha in Madison County,"
Proceedings of the Iowa Academy of Science, 36(1), 278-278.
Available at: https://scholarworks.uni.edu/pias/vol36/iss1/68