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  1. 1
    by Sperry, Omer Edison, Pond, Floyd W.
    Published 1957
    Available online via OAK Trust Repository
    Government Document Book
  2. 2
    by Sperry, Omer Edison
    Published 1951
    Government Document Book
  3. 3
  4. 4
    by Walker, A. H., Sperry, Omer Edison
    Published 1953
    Available online via OAK Trust Repository
    Government Document Book
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