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1973. 2013-04-23T19:50:07Z. 2023-02-09T21:27:16Z. Hansen, Robert E. Dept. of the Interior, U.S. Geological Survey. English. Public. Iowa.
1973. 2018-04-20T19:01:57Z. 2018-09-05T19:39:35Z. Horick, Paul J. Iowa Geological Survey. English. cartographic image. Public. Iowa and Iowa.
