Soil Survey of Iowa, Report No. 35—Dubuque County Soils
Dubuque county is located in northeastern Iowa along the Mississippi D river being in the'second tier oi counties south of the Minnesota state line and adjoinfng Wisconsin and Illinois on the east. The location rs shown in the accompanying sketch map. It lies partly in the Mississippi loess and partly in the Iowan drift soil area and hence its soils are of loessial and glacial origin.