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  1. By: Maryland Geological Survey. - Abbe, Cleveland, - Bauer, L. A. (Louis Agricola), - Clark, William Bullock, - Dorsey, Clarence W. - Fassig, Oliver L. - Merriam, C. Hart (Clinton Hart), - Newell, Frederick Haynes, - O'Harra, Cleophas C. - Preble, Edward Alexander, - Sudworth, George B. (George Bishop),
    Publication info: Baltimore, Johns Hopkins Press, 1900
    Holding Institution: University of Toronto - Robarts Library
  2. By: O'Harra, Cleophas C.
    Publication info: Rapid City, S.D, [The Daily Journal], 1910
    Holding Institution: Smithsonian Libraries and Archives
  3. By: O'Harra, Cleophas C.
    Publication info: Rapid City, S.D, 1920
    Holding Institution: Smithsonian Libraries and Archives