Image: Mammoth Cave Saltpeter Mine
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Description: Ruins of an abandoned saltpeter mine inside Mammoth Cave. Active during the early 19th century due to a saltpeter shortage during the War of 1812
Author: Bpluke01
Usage Terms: Creative Commons Attribution-Share Alike 3.0
License: CC-BY-SA-3.0
License Link: http://creativecommons.org/licenses/by-sa/3.0/
Attribution Required?: Yes
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