Credit: Atlas of Pennsylvania, Temple University Press, 1989.
These five color coded Pennsylvania maps, dated 1840, 1860, 1890, 1920, and 1950, break down the timeline of coal production in Pennsylvania.
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Pennsylvania Bituminous and Anthracite Coal Production, 1840 -1950.
Credit: Atlas of Pennsylvania, Temple University Press, 1989.
These five color coded Pennsylvania maps, dated 1840, 1860, 1890, 1920, and 1950, break down the timeline of coal production in Pennsylvania.
