[CITATION][C] Saltpetre Mining in Mammoth Cave, KY.

B Faust - 1967 - Filson Club
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[CITATION][C] Saltpetre mining in Mammoth Cave, Kentucky

B Faust - Filson Club Hist Quart, 1967
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[CITATION][C] Saltpetre Mining in Mammoth Cave

B Faust - Kentucky. Jr. Spelean History, I, 1967
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