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  1. By: Swain, Frederick M. (Frederick Morrill), - Brown, Philip M. (Philip Monroe), - Geological Survey (U.S.)
    Publication info: [Raleigh, N.C.] :U.S. Geological Survey,1964.
    Holding Institution: State Library of North Carolina (archive.org)
  2. By: Brown, Philip M. (Philip Monroe),
    Publication info: [Raleigh, N.C.] :s.n.,1957.
    Holding Institution: State Library of North Carolina (archive.org)
  3. By: Brown, Philip M. (Philip Monroe), - North Carolina. Division of Mineral Resources. - Geological Survey (U.S.)
    Publication info: [Raleigh],1958.
    Holding Institution: University Library, University of Illinois Urbana Champaign