Geologic map of Illinois / compiled by H.B. Willman and others.
"Base map by U.S. Geological Survey." 6 Insets: Structure on top of Galena group, and index to cross sections -- Glacial map -- Thickness of surficial deposits -- Sub-St. Peter geologic map -- Sub-Middle and Upper Devonian geologic map -- Sub-Pennsylvanian geologic map. Includes notes, 2 color stratigraphic sections, and 3 color cross sections.
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