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Paul Nevin, an expert on Native American petroglyphs, consults a map of about 150 carvings on Little Indian Rock on Tuesday, June 19, 2018, near the Safe Harbor Dam, Lancaster County, Pa.   There are about 300 carvings on seven mica schist rocks amid a jumble of other rocks out here in the middle of the river. It is believed they were carved by Shenks Ferry Native Americans, using simple stone tools over a period from 500 to 1,000 years ago.  (Ad Crable /LNP via AP)

Paul Nevin, an expert on Native American petroglyphs, consults a map of about 150 carvings on Little Indian Rock on Tuesday, June 19, 2018, near the Safe Harbor Dam, Lancaster County, Pa. There are about 300 carvings on seven mica schist rocks amid a jumble of other rocks out here in the middle of the river. It is believed they were carved by Shenks Ferry Native Americans, using simple stone tools over a period from 500 to 1,000 years ago. (Ad Crable /LNP via AP)

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