| 11. | Simons began exploiting Mammoth Cave for its saltpeter reserves.
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| 12. | Most saltpeter mining occurred during the War of 1812 and the Civil War.
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| 13. | Lookout Mountain Cave was a major source of saltpeter during the Civil War.
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| 14. | Woodlee Cave, located in Northcutts Cove, was also mined for saltpeter.
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| 15. | Fentress County was the site of several saltpeter mines.
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| 16. | The former Chilean saltpeter mining communities of Unesco World Heritage sites in 2005.
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| 17. | British India was the only source of the saltpeter used in Union gunpowder.
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| 18. | A total of of powder made from saltpeter was used for the tunneling.
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| 19. | The early saltpeter miners discovered the bones of a large, unknown animal.
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| 20. | Recipe no . 14 contains advice for the harvesting and processing of saltpeter.
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