@article{20702,
      recid = {20702},
      author = {Cobb, James C.},
      title = {The abundance of zinc and cadmium in sphalerite-bearing  coals in Illinois /},
      publisher = {Illinois State Geological Survey, Division of Illinois  Institute of Natural Resources,},
      address = {Urbana :},
      pages = {28 p. :},
      year = {1980},
      note = {Cover title.},
      url = {http://library.usi.edu/record/20702},
}