Image: Harvard Museum of Natural History. Pyrite. Coal mines of Sparta, Randolph Co., Il (DerHexer) 2012-07-20
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Description: Harvard Museum of Natural History. Pyrite. Coal mines of Sparta, Randolph Co., Il.
Title: Harvard Museum of Natural History. Pyrite. Coal mines of Sparta, Randolph Co., Il (DerHexer) 2012-07-20
Credit: Own work
Author: DerHexer, Wikimedia Commons
Usage Terms: Creative Commons Attribution-Share Alike 4.0
License: CC BY-SA 4.0
License Link: http://creativecommons.org/licenses/by-sa/4.0
Attribution Required?: Yes
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