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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: Shannon, Charles William,
    Publication info: Norman :Oklahoma Geological Survey,1913.
    Holding Institution: New York Botanical Garden, LuEsther T. Mertz Library
    BHL Collections: New York Botanical Garden