Pennsylvania canals, rail roads the coal regions, and number of inhabitants, in each county of the state.
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Pennsylvania canals, rail roads the coal regions, and number of inhabitants, in each county of the state., map, Date Unknown; [Philadelphia, Pennsylvania]. (texashistory.unt.edu/ark:/67531/metapth192623/: accessed February 21, 2019), University of North Texas Libraries, The Portal to Texas History, texashistory.unt.edu; crediting University of Texas at Arlington Library.