@article{226399,
      recid = {226399},
      author = {Gill, James R. and Cobban, William A., and Schultz,  Leonard Gene,},
      title = {Stratigraphy and composition of the Sharon Springs Member  of the Pierre Shale in western Kansas,},
      publisher = {U.S. Govt. Print. Off.,},
      address = {Washington,},
      pages = {iv, 50 p. :},
      year = {1972},
      url = {http://library.usi.edu/record/226399},
}