. Mining coal three miles under ground, Pennsylvania, Alternate Title: 1662. Coverage: 1860?-1900?. Source Imprint: 1860?-1900?. Digital item published 7-18-2005; updated 2-13-2009. 191 Mining coal three miles under ground, Pennsylvania, , from Robert N. Dennis collection of stereoscopic views

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Photo credit: © The Picture Art Collection / Alamy / Afripics
License: Licensed
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Keywords: ., 1860?-1900?., coverage, digital, imprint, source