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  1. By: Pan-American Scientific Congress Washington, D.C.
    Publication info: Washington, D.C.,1915?
    Holding Institution: University of California Libraries (archive.org)
  2. By: Pan-American Scientific Congress Washington, D.C. - Barrett, John, - Swiggett, Glen Levin
    Publication info: Washington,Govt. Print. Off.,1917.
    Holding Institution: University of California Libraries (archive.org)