
The anthracite coal region of central Pennsylvania is defined here by the sharp, parallel ridges of the Appalachian Mountains, where industrial activity follows the narrow valley floors. Coal or Thick Mountain and Big Mountain dominate the central landscape, housing the productive seams that fueled the growth of towns like Lykens, Wiconisco, and Williamstown. The mapping captures a dense network of early transportation, including the Summit Branch Railroad and several branches of the P. and R. Railroad, which were vital for moving coal from the collieries to market.
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