http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
1 map : color ; 38 x 43 cm., on sheet 45 x 72 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 topographic maps dated 1965-1982. Planimetry revised from aerial photographs taken 1978-84 and other source data.
Includes location diagram 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 ;