Image: USGS map of Galena mines
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Description: USGS map of Galena mines, with the Ordovician Galena limestone denoted in light brown.
Title: USGS map of Galena mines
Credit: Zinc and lead deposits of northwestern Illinois, USGS Bulletin 246, https://pubs.er.usgs.gov/publication/b246
Author: Harry Foster Bain
Usage Terms: Public domain
License: Public domain
Attribution Required?: No
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