Bell Telephone Systems, 1953, orig. published The Bell System Technical Journal, vol 32, May 1953; separate offprint, Monograph 2123, 8.5x11 large size, pp 1-18.
Condition: Very Good, 8.5x11 light gray and blue stiff paper covers, 3-hole-punched at margin, faded along staples and front cover spine, light shelfwear, crease to lower front cover corner. Stapled binding is tight, pages clean and unmarked. Has printed notation at lower front corner, Compliments of, Northern Electric Company Limited.
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