@article{54111,
      note = {Cover title.},
      author = {Heigold, Paul C.},
      url = {http://library.usi.edu/record/54111},
      title = {A gravity survey of extreme southeastern Illinois},
      publisher = {Illinois State Geological Survey,},
      recid = {54111},
      pages = {12 p.},
      address = {Urbana,},
      year = {1970},
}