1903. 2011-05-23T18:54:24Z. 2015-10-21T14:59:46Z. U.S. Geological Survey. English. Public. Benton County (Iowa), Iowa County (Iowa), Iowa, Johnson County (Iowa), Keokuk County (Iowa), Linn County (Iowa), and Washington County (Iowa).
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1903. 2011-05-23T19:31:36Z. 2015-10-21T14:59:47Z. U.S. Geological Survey. English. Public. Benton County (Iowa), Buchanan County (Iowa), Delaware County (Iowa), Iowa, and Linn County (Iowa).