http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
1 map : color ; 32 x 42 cm., on sheet 41 x 71 cm.
produced by the United States Geological Survey in cooperation with the Iowa Geological Survey.
Relief shown by contours and spot heights.
Compiled from USGS 1:24 000-scale topogrqaphic maps dated 1972-1980. Planimetry revised from aerial photographs taken 1973-1980 and other source data. Map edited 1987.
Includes location diagrams and index to 1:24 000-scale maps.
Designed to be folded to approximately 21 x 11 cm.
Scale 1:100,000. 1 cm. on the map represents 1 km. on the ground ;