@article{,
      note = {"May 1989"; "March 1989"--P. [3] of cover.},
      author = {Paige, John C.},
      url = {http://library.usi.edu/record/453700},
      title = {Pennsylvania Railroad shops and works, Altoona,  Pennsylvania /},
      publisher = {America's Industrial Heritage Project, U.S. Dept. of the  Interior, National Park Service,},
      number = {NPS D-1},
      recid = {453700},
      pages = {v, 156 p. :},
      address = {[Denver] :},
      year = {1989},
}