Recent Monographs of Bell System Technical Papers Not Published in This Journal

Bibliography on Ultrasonic Delay Lines, Monograph 2317. Mobility of Impurity Ions in Germanium and Silicon, Monograph T. H., sec Matthias, B. T . F FULLER, C . S . , a n d SEVERIENS, J . C . 2309. GEBALLE, GELLER, S . sec Matthias, B. T. HAGSTRITM, H. D. HAGSTRUM, I I . I). KARP, A . Auger Ejection of Electrons from Tungsten, Monograph 2313. Auger Ejection of Electrons from Metals by Ions, Monograph 2351. Traveling-Wave Tube Experiments at Millimeter Wavelengths, Monograph 2369. 4 Department, B«-ll Telephnnr Laboratories, Inc., 463 Went Street. Now York 14, Copies of these monographs may lx» obtained on request to the Publication N. V. The numbers of the monographs should lie given in all requests. 448 RECENT MONOGRAPHS 440 LAW, J. T.