@article{126439,
      author = {Droste, John Brown, and Keller, Stanley J.},
      url = {http://library.usi.edu/record/126439},
      title = {Development of the Mississippian-Pennsylvanian  unconformity in Indiana /},
      publisher = {Dept. of Natural Resources, Geological Survey,},
      recid = {126439},
      pages = {11 p. :},
      address = {Bloomington, Ind. :},
      year = {1989},
}