@article{10995,
      author = {Du Bois, Ernest Paul, and Bays, Carl Andrew,},
      url = {http://library.usi.edu/record/10995},
      title = {Subsurface relations of the Maquoketa and "Trenton"  formations in Illinois : petroleum possibilities of  Maquoketa and "Trenton" in Illinois /},
      publisher = {Illinois State Geological Survey,},
      recid = {10995},
      pages = {38 p. :},
      address = {Urbana :},
      year = {1945},
}