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  1. By: Oklahoma Geological Survey. - Cross, Howard. - Stevens, George Walter. - Shannon, Charles William,
    Publication info: Norman,1917.
    Holding Institution: Cornell University Library
  2. By: Snider, Luther C. (Luther Crocker), - Oklahoma Geological Survey.
    Publication info: Norman :[University of Oklahoma?],1915.
    Holding Institution: University of British Columbia Library (archive.org)