Public domain
Pittsburgh, Pennsylvania (vicinity). Montour no. 4 mine of the Pittsburgh Coal Company. Slate is loaded into separate cars in the mine and when the "trips" come into the tripple, the slate is dumped onto a conveyor belt which dumps it into moving overhead cars which carry the refuse a mile up the hi
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Credit linePittsburgh, Pennsylvania (vicinity). Montour no. 4 mine of the Pittsburgh Coal Company. Slate is loaded into separate cars in the mine and when the "trips" come into the tripple, the slate is dumped o. 1942-01-01. Collier, John, Jr., Collier, John. Farm Security Administration/Office of War Information Collection, Library of Congress. Public domain.
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