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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 - Newell, Frederick Haynes, - O'Harra, Cleophas C. - Preble, Edward A. - Sudworth, George B.
    Publication info: Baltimore :Johns Hopkins Press,1900.
    Contributed by: Robarts - University of Toronto (archive.org)
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  2. Baltimore county.
    By: Maryland Geological Survey. - Bauer, L. A. - Berry, Edward Wilber, - Besley, F. W. - Bruce, Oscar Clayton, - Carter, William T. - Jonas, Anna I. - Knopf, Eleanora Frances Bliss, - Mathews, Edward Bennett, - Nunn, Roscoe. - Snyder, Joseph M., - Watson, Edward Hahn,
    Publication info: Baltimore,The Johns Hopkins press,1929.
    Contributed by: Wellesley College Library (archive.org)
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  3. Calvert county.
    By: Maryland Geological Survey - Bauer, L. A. - Bonsteel, Jay Allan, - Burke, R. T. Avon. - Curran, Hugh M. - Grover, Nathan Clifford, - Miller, Benjamin L. - Shattuck, George Burbank, - Von Herrmann, Charles F.
    Publication info: Baltimore,The Johns Hopkins Press,1907.
    Contributed by: Smithsonian Libraries
    BHL Collections: Smithsonian Libraries
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  4. Cecil county.
    By: Maryland Geological Survey - Bascom, F. - Bauer, L. A. - Bonsteel, Jay Allan, - Curran, Hugh M. - Dorsey, Clarence Wilbur, - Fassig, Oliver Lanard, - Mathews, Edward Bennett, - Pressey, Henry Albert, - Shattuck, George Burbank, - Sudworth, George Bishop, - Geological Survey (U.S.) - United States.
    Publication info: Baltimore,The Johns Hopkins Press,1902.
    Contributed by: Smithsonian Libraries
    BHL Collections: Smithsonian Libraries
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  5. Kent county.
    By: Maryland Geological Survey. - Bauer, L. A. - Besley, F. W. - Bonsteel, Jay A. - Grover, Nathan Clifford, - Miller, Benjamin L. - Nunn, Roscoe.
    Publication info: Baltimore,The Johns Hopkins press,1926.
    Contributed by: Wellesley College Library (archive.org)
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  6. Prince George's County.
    By: Maryland. - 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.
    Contributed by: Smithsonian Libraries
    BHL Collections: Smithsonian Libraries
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  7. St. Mary's County.
    By: Maryland. - Bauer, L. A. - Bonsteel, Jay Allan, - Grover, Nathan Clifford, - Meil, Clayton Dissinger. - Miller, Benjamin L. - Shattuck, George Burbank, - Von Herrmann, Charles F.
    Publication info: Baltimore,The Johns Hopkins Press,1907.
    Contributed by: Smithsonian Libraries
    BHL Collections: Smithsonian Libraries
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