Paper version: In stock and available from the USGS Store
Additional Publication Details
USGS Numbered Series
Hydrologic Unit Map -- 1974, Iowa
col. map 75 x 112 cm. fold. in envelope 30 x 24 cm.; An overprint of the 1:500,000-scale state base map. Shows counties, location, and names of all cities and towns and most of the smaller settlements, railroads, and township and range lines in black; water features in blue; hydrologic boundaries and codes in red; county codes in green. No contours. Sheet 33 by 46 inches. 1974 base.