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  1. By: Maryland Geological Survey. - Bauer, L. A. - Berry, Edward Wilber, - Besley, F. W. - Bruce, Oscar Clayton, - Carter, William T. (William Thomas), - Jonas, Anna I. (Anna Isabel), - Knopf, Eleanora Frances Bliss, - Mathews, Edward Bennett, - Nunn, Roscoe. - Snyder, Joseph M., - Watson, Edward Hahn,
    Publication info: Baltimore,The Johns Hopkins press,1929.
    Holding Institution: Wellesley College Library (archive.org)