@article{200556,
      note = {Cover title.},
      author = {Bullock, John H.},
      url = {http://library.usi.edu/record/200556},
      title = {Analytical results of insoluble-residue samples from the  Paducah 1° x 2° quadrangle, Missouri, Illinois, and  Kentucky, drill holes nos. P1-P20 [microform] /},
      publisher = {U.S. Dept. of the Interior, Geological Survey :},
      recid = {200556},
      pages = {138 leaves :},
      address = {Denver, CO :},
      year = {1991},
}