Recent Monographs of Bell System Technical Papers Not Published in thisJournal

New Small Crossbar Telephone System for Private Branch Exchanges, Monograph 3252. AL-MADFAI, S., see Frisch, H. L. ANDERSON, P . W . Random-Phase Approximation in the Theory of Superconductivity, Monograph 3264. ASHKIN, A . Dynamics of Electron Beams from Magnetically Shielded Guns, Monograph 3220. ASHKIN, A . Parametric Amplification of Space Charge Waves, Monograph 3221. ASHKIN, A . , BRIDGERS, T . J . , LOUISELL, W . H . a n d QUATE, C . F .