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  1. 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. (George Bishop),
    Publication info: Baltimore :Johns Hopkins Press,1900.
    Holding Institution: University of Toronto - Robarts Library
    Subjects: Allegany County  Allegany County (Md.)  Forests and forestry  Geology  Maryland  Mines and mineral resources  Physical geography  
  2. By: Woodruff, John Grant. - Colgate University.
    Publication info: Albany,University of the State of New York,1942.
    Holding Institution: New York Botanical Garden, LuEsther T. Mertz Library
    Subjects: Allegany County  Devonian  Devonian Geologic Period  From 345 to 405 million years ago  Geology  Geology, Stratigraphic  Natural gas  New York (State)
    BHL Collections: Expanding Access to Biodiversity Literature | New York Botanical Garden