@article{17989,
      author = {Collinson, Charles William.},
      url = {http://library.usi.edu/record/17989},
      title = {Guide for beginning fossil hunters /},
      publisher = {Illinois State Geological Survey,},
      recid = {17989},
      pages = {34 [2] p. :},
      address = {Urbana :},
      year = {1956},
}