Lot of 23 individual Bell Telephone System Monographs, see list.
Bell Telephone System Technical Publications, monographs, 8.5x11 blue-gray covers, stapled bindings, var. pagination, 5-hole punched at margins.
Bell Telephone System Technical Publications, monographs, 8.5x11 blue-gray covers, stapled bindings, var. pagination, 5-hole punched at margins.