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  1. 1
    by Planty, Earl
    Published 1948
    New York, Ronald Press Co. [c1948]
    xiii, 278 p. illus. 24 cm.
  2. 2
    [Murray Hill, N.J., etc., Bell Telephone Laboratories]
    61 v. ill., ports., diagrs. 26 cm.
    Available on microfilm from University Microfilms International.
    Also issued online.

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