Bell System Technical Journal volume XXXVII Number 5 september 1958; vol 37 no 5.
American Telephone & Telegraph Co, 1958; i-vi, pp 1091-1326, illus, photos, references.
American Telephone & Telegraph Co, 1958; i-vi, pp 1091-1326, illus, photos, references.
Electronics research publishing co, NY 1947 first edition; 202 pages,Cross Index of Subjects at rear.
Prepared by Bell Telephone Laboratories, Inc for Western Electric Co, Inc, New York, NY 1951; 792 pages.