@article{227135,
      author = {Pettijohn, F. J.},
      url = {http://library.usi.edu/record/227135},
      title = {Geology of the northern Crystal Falls area, Iron County,  Michigan.},
      recid = {227135},
      pages = {iii, 17p.},
      address = {Washington,},
      year = {1952},
}