Ludwig, Charles Herbert.
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Role | Title | Holding Repository | |
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creatorOf | Ludwig, Charles Herbert. The history and methods of electrification of the Pennsylvania Railroad between Baltimore and Washington, D.C. / by Charles Herbert Ludwig. | University of Maryland (College Park, Md.). Libraries | |
creatorOf | Ludwig, Charles Herbert. The history and methods of electrification of the Pennsylvania Railroad between Baltimore and Washington, D.C. [electronic resource] / by Charles Herbert Ludwig. | University of Maryland (College Park, Md.). Libraries |
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Ludwig, Charles Herbert.
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