2003. USGS National Center for EROS. The North America Shaded Relief data were derived from the GTOPO30 elevation data. GTOPO30 is a global digital elevation model (DEM) with a horizon... National Atlas of the United States.
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1870. (Thompson & Everts, 1870, Combination Atlas Map of Henry County, Iowa); 1 atlas: b&w.; 38 X 44 cm. Material in the public domain. No restrictions o... Thompson & Everts.
1870. Thompson and Evert's 1870 Combination atlas map of Johnson County, Iowa.; 1 atlas: 37 p.; 44 cm. Material in the public domain. No restrictions on ... Thompson and Everts.
1922. Geo. A. Ogle & Co.
165. Coralville
1900. Huebinger Survey and Map Publishing Co.
Big Ten Academic Alliance Geospatial Information Network.
1908. W. E. Walter & Co.'s 1908 County Atlas of Appanoose County, Iowa.; 1 atlas: 40 p.; 38 cm. Material in the public domain. No restrictions on use. St... W. E. Walter & Co.
1980. Geological Survey (U.S.). This polygon shapefile contains the 1980 state and county boundaries of the United States, Puerto Rico, and the U.S. Virgin Islands. The map layer ... Geological Survey (U.S.).
2005. Geological Survey (U.S.). This polygon shapefile portrays the 1990 state and county boundaries of the United States, Puerto Rico, and the U.S. Virgin Islands. The map layer ... Geological Survey (U.S.).
2000. Geological Survey (U.S.). This polygon shapefile portrays the 2000 state and county boundaries of the United States, Puerto Rico, and the U.S. Virgin Islands. The map layer ... Geological Survey (U.S.).
