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Prehistoric sites include a Native American rockshelter in the Daniel Boone National Forest, and historic sites include Saltpeter Cave, a frontier-era niter mine in Carter County, the statement said.—From Usa Today Network and Wire Reports, USA TODAY, 23 Sep. 2022
Word History
Etymology
Middle English nitre natron, from Middle French, from Latin nitrum, from Greek nitron, from Egyptian nṯry
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