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  1. By: Van Hise, Charles Richard, - Leith, Charles Kenneth, - Martin, Lawrence,
    Publication info: Washington, Govt. print. off, 1911
    Holding Institution: University of Connecticut Libraries
  2. By: Phalen, William Clifton, - Martin, Lawrence, - Pennsylvania. Bureau of Topographic and Geologic Survey.
    Publication info: Washington, Government Printing Office, 1911
    Holding Institution: University Library, University of Illinois Urbana Champaign