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USGS Quadrangle
   
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Lyon Osceola Dickinson Emmet Allamakee Kossuth Winneshiek Howard Winnebago Mitchell Worth Sioux Obrien Clay Palo Alto Hancock Cerro Gordo Chickasaw Floyd Clayton Fayette Plymouth Cherokee Buena Vista Pocahontas Humboldt Wright Bremer Franklin Butler Dubuque Delaware Webster Buchanan Black Hawk Woodbury Ida Sac Calhoun Hamilton Hardin Grundy Jackson Jones Linn Benton Tama Monona Crawford Carroll Greene Boone Story Marshall Clinton Cedar Harrison Shelby Audubon Guthrie Johnson Dallas Iowa Polk Poweshiek Jasper Scott Muscatine Pottawattamie Cass Washington Adair Keokuk Warren Madison Mahaska Marion Louisa Mills Montgomery Adams Henry Jefferson Union Wapello Clarke Lucas Monroe Des Moines Fremont Page Taylor Ringgold Van Buren Davis Decatur Wayne Appanoose Lee

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