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Pittsburgh, Pennsylvania (vicinity). Montour no. 4 mine of the Pittsburgh Coal Company. Safety lamps in lamp house. Sourced…
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Pittsburgh, Pennsylvania (vicinity). Montour no. 4 mine of the Pittsburgh Coal Company. Safety lamps in lamp house. Sourced from the Library of Congress.

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Pittsburgh, Pennsylvania (vicinity). Montour no. 4 mine of the Pittsburgh Coal Company. Safety lamps in lamp house. Sourced from the Library of Congress.

More