Geologic map of Illinois, compiled by H.B. Willman and others (3.5919)
Date: 1967Creator: Willman, H. B.
Type: Map
Description:"Base map by U.S. Geological Survey."
Extent: 1 sheet
Geologic map of Illinois, compiled by H.B. Willman and others (3.5920)
Date: 1967Creator: Willman, H. B.
Type: Map
Description:"Base map by U.S. Geological Survey."
Extent: 1 sheet