@article{527,
      author = {Averitt, Paul,},
      url = {http://library.usi.edu/record/527},
      title = {Stripping-coal resources of the United States--January 1,  1970.},
      publisher = {U.S. Govt. Print. Off.,},
      recid = {527},
      pages = {iv, 34 p.},
      address = {Washington,},
      year = {1970},
}