Some of these articles were reprinted by the Bell System as Monographs, consecutively issued starting in 1920. These reprints, numbering over 5000, comprise a catalog of Bell research over the decades. Research in the Monographs is aided by access to associated indexes, for monographs 1–1199, 1200–2850 (1958), 2851–4050 (1962), and 4051–4650 (1964).
Some of these articles were reprinted by the Bell System as Monographs consecutively issued starting in 1920 These reprints numbering over 5000 comprise a catalog of Bell research over the decades Research in the Monographs is aided by access to associated indexes for monographs 1–1199 1200–2850 (1958) 2851–4050 (1962) and 4051–4650 (1964)