Bell Telephone System Technical Publications, BT Labs NY, n.d. [1936?); Monograph B-868; 64 pages.
Condition: Very Good overall, light-blue-green paper wraps, 3-hole punched as issued; toning & sunning to outer edges, some creasing & thumb-wear along outer margins of covers & most pages. Binding is tight & pages are clean & unmarked. Card pocket inside rear cover but no indication of library stamps or markings - possibly a corporate artifact.
Categories: 1950's computers and computing, Databooks, Handbooks, Manuals, Electronic and Electrical Engineering, Technical Journals, Proceedings, Conferences, Bell System Technical Journals, BSTJ pre-1940