Release Date: November, 1974
Released By: UNIX Support Group
Source Code: None Available
Documentation: UNIX Operating System Generic Program Issue 1 describes the files comprising the first Issue of USG Program Generic. This source structure is further described in another report, and the boot process is also described, all in the USG Library.

UNIX Program Generic Issue 1, otherwise known as PG-1C300, is a version of the UNIX operating system issued by the UNIX Support Group in November of 1974. The Program Generic line was used as a standard, supported UNIX base on which to base other projects and supply a computing environment to a larger group of users than the Research group could support.

This version appears to be comparable to Fourth Edition Unix, albeit retaining some components from earlier Research versions and incorporating some new features that would show up in later systems of other branches. In particular, a reorganization of source files was undertaken upon establishing the Program Generic line.