In these two volumes, original developers of the UNIX system describe the most current operating system and protocol, and survey current research at AT&T's Bell Laboratory. Vol. I, Programmer's manual ($32.95), covers programs, subroutines, file systems and structures, macro-packages, information sources, and software for the Teletype 56520 terminal. Vol. II, Papers ($33.95), comprises 40 essays on documentation, preparation, programming, supporting tools and languages, implementation and maintenance, and music, graphics, and image-processing applications. Annotation copyright Book News, Inc. Portland, Or.