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  1. 1
    Published 1930
    New York, N. Y., National research council, Division of engineering and industrial research, 1930.
    91 p. 23 cm.
  2. 2
    Leningrad, Izd-vo Akademii nauk SSSR [Leningradskoe otd-nie] 1962.
    123 p. illus. 22 cm.

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