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  1. By: Procter, John Robert, - Kentucky Geological Survey and Bureau of Immigration.
    Publication info: Frankfort, Ky, S.I.M. Major, public printer, 1881
    Holding Institution: Smithsonian Libraries and Archives
  2. By: Kentucky Geological Survey. - Peter, Robert, - Procter, John Robert,
    Publication info: Frankfort?, Yeoman Office, S.I.M. Major, public printer, 188-
    Holding Institution: Smithsonian Libraries and Archives