@article{869543,
      recid = {869543},
      title = {Guide around the switch-back : and history of the  discovery of coal in the Lehigh Valley.},
      pages = {1 online resource (32 pages) :},
      note = {Cover title: Around the switch-back railroad, and  discovery of coal in the Lehigh Valley.},
      url = {http://library.usi.edu/record/869543},
}