EarthWorks Geospatial Catalog

Chicago areal geologic maps [cartographic material] / by J. Harlen Bretz.

Covers most of Cook County, and small portions of Lake, DuPage, and Will Counties. "Geologically surveyed in 1930-1932"--Lower margin. Relief shown by contours and spot heights. In upper margin: Committee of the Board of Natural Resources and Conservation. Maps 21 and 22 on one sheet; also maps 23 and 24. Index map on each sheet.
State of Illinois, Dept. of Registration and Education, State Geological Survey Division
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