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Scientific American, Vol. 73, No. 13 (1895) (1895)
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king trough in the West Mahanoy district, Schuylkill County, and Pennsylvania, while mines yielding bituminous coal is one of the mines of the system of the Philadelphia by lifting a shutter, when a new charge is taken into are pretty well scattered over the country. But few and Reading Coal and… … UT © 1895 SCIENTIFIC AMERICAN, INC.Internet Archive · Public domain (published before 1931). Free to use for anything.
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