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  1. Allegany County.
    By: Maryland Geological Survey. - Abbe, Cleveland, - Bauer, L. A. - Clark, William B. - Dorsey, Clarence W. - Fassig, Oliver L. - Merriam, C. Hart (Clinton Hart), - Newell, Frederick Haynes, - O'Harra, Cleophas C. - Preble, Edward A. - Sudworth, George B.
    Publication info: Baltimore :Johns Hopkins Press,1900.
    Holding Institution: University of Toronto - Robarts Library
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  2. Prince George's County.
    By: Maryland. Geological Survey, 1896- - Alexander, William Henry, - Bauer, L. A. - Besley, Fred Wilson, - Bonsteel, Jay Allan, - Miller, Benjamin Le Roy, - Newell, Frederick Haynes,
    Publication info: Baltimore,The Johns Hopkins Press,1911.
    Holding Institution: Smithsonian Libraries
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