The Bell System Technical Journal 1956 LOT of 2 individual issues, volume XXXV numbers 5, 6; September 1956, November 1956.
AT&T BSTJ 1956, pp. 991-1466 in 2 separate issues; diagrams, references.
AT&T BSTJ 1956, pp. 991-1466 in 2 separate issues; diagrams, references.
AT&T 1956; pp 1 - 245 inclusive; photographs, diagrams; references.
American Telephone & Telegraph Co, march 1956; pp 249-534; illus, photographs, refs; charts foldouts.
Bell Tel. Labs, NY issued June 1956 printed inside rear cover, published in Bell Sys. Technical Journal March 1956; 38 pages, diagrams, references.
Bell Tel. Labs, NY 1947, 1956, 1963, 43 pages, diagrams, tables, references.