Bell System Technical Journal volume XXXV, number 1, January 1956; volume 30 no. 1.
AT&T 1956; pp 1 - 245 inclusive; photographs, diagrams; references.
AT&T 1956; pp 1 - 245 inclusive; photographs, diagrams; references.
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 issued November 1955 printed inside rear cover, published in Proc. of the IRE July 1955, 9 pages plus 2 blank sheets at rear; double column text, diagrams, references.
Bell Tel. Labs., NY issued January 1957 stated inside rear cover; published in Proc. of the IRE 1955; 8 pages, double-column text, diagrams.
Bell Tel. Labs, NY 1947, 1956, 1963, 43 pages, diagrams, tables, references.