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Please read BHL's Acknowledgment of Harmful Content
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  1. By: Maryland Geological Survey. - Alexander, William Henry, - Bauer, L. A. (Louis Agricola), - Besley, Fred Wilson, - Bonsteel, Jay A. (Jay Allan), - Miller, Benjamin Le Roy, - Newell, Frederick Haynes,
    Publication info: Baltimore, The Johns Hopkins Press, 1911
    Holding Institution: Smithsonian Libraries and Archives