Following is part III of the listing of 241 papers presented. Bell System's Digital Data Service - An Overview. By R. J. Blackburn and P. E. Muench. Interconnection of Data Networks. By E. P. G. Wright. Dependable Data Networks. By P. Akani. Future Peripheral Equipment for Clocked Networks. A Study of the Potential Advantages to Users and Network Designers. By G. C. Hartley and F. Lengyel. Phased Implementation of Telex and Data Systems. By J. Atkin and B. A. Edwards. Time Division Multiplex Switching in Modern Data Switching Systems. By B. Schaffer. Gaussian and Click Noise in an FM/FM Multiplex Receiver. By N. H. Stochel and D. L. Schilling. Analysis of Differential PCM Systems with Coarse Quantization. By K. Y. Chang and R. W. Donaldson. Gated Phase-Locked Loop in the Presence of Noise. By H. I. Paul and W. E. Larimore.