Image: Illinois Basin Structure Map
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Description: Illinois Basin Structure Map
Title: Illinois Basin Structure Map
Credit: Geologic Overview, Chapter C of Resource Assessment of the Springfield, Herrin, Danville, and Baker Coals in the Illinois Basin, U.S. Geological Survey Professional Paper 1625–D, https://pubs.usgs.gov/pp/p1625d/Chapter_C.pdf
Author: J.R. Hatch and R.H. Affolter
Usage Terms: Public domain
License: Public domain
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