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  1. By: Lesquereux, Léo, - Geological Survey of Pennsylvania. - Pennsylvania. Board of Commissioners for the Second Geological Survey.
    Publication info: Harrisburg, Board of Commissioners for the Second Geological Survey, 1879-84
    Holding Institution: Wellesley College Library (archive.org)
    BHL Collections: Fossil Stories
  2. By: Fontaine, William Morris, - White, I. C. (Israel Charles), - Geological Survey of Pennsylvania. - Pennsylvania. Board of Commissioners for the Second Geological Survey.
    Publication info: Harrisburg, Pub. by the Board of Commissioners for the Second Geological Survey, 1880
    Holding Institution: Wellesley College Library (archive.org)