Saltpeter works in the cave at Shellmound, Tenn. (Nickajack Cave), still image, Sketches, 1861 - 1864, Hillen, J. T. E

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Photo credit: © Artokoloro / Alamy / Afripics
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Keywords: ., 1861, 1864, cave, hillen, nickajack, saltpeter, shellmound, sketches, tenn., works