@article{4911,
      recid = {4911},
      author = {Averitt, Paul,},
      title = {Coal resources of the United States, January 1, 1974 /},
      publisher = {U.S. Govt. Print. Off.,},
      address = {Washington :},
      pages = {vi, 131 p. :},
      year = {1975},
      url = {http://library.usi.edu/record/4911},
}