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Shenandoah (vicinity), Pennsylvania. Timbers in tunnel 29 of the Maple Hill mine, at the end where they are leaving the column and the rock has already fallen. Sourced from the Library of Congress.

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Shenandoah (vicinity), Pennsylvania. Timbers in tunnel 29 of the Maple Hill mine, at the end where they are leaving the column and the rock has already fallen. Sourced from the Library of Congress.

More