Dubuque County, Iowa : 1:100 000-scale topographic map / produced by the United States Geological Survey in cooperation with the Iowa Geological Survey
Scale 1:100,000. 1 cm on the map represents 1 km on the ground ; Universal transverse Mercator projection (W 91°09ʹ--W 90°28ʹ/N 42°41ʹ--N 42°17ʹ).
Note
"County map showing contours and elevations in feet; highways, roads and other manmade structures; water features; woodland areas; geographic names." Relief shown by contours and spot heights. "Compiled from USGS 1:24 000-scale topographic maps dated 1955-1980 ... Planimetry revised from aerial photographs taken 1982-83 ... Map edited 1985." Includes location map/sheet index, index to topographic maps, location map, and meters/feet conversion table. "42090-E6-CF-100."