Release Date: December, 1973
Released By: UNIX Support Group
Source Code: None Available
Documentation: No surviving primary documentation.
Very little information about the first USG release survives. It was followed shortly by the monthly USG UNIX Newsletter. A trouble reporting system was established in which system problems were published in each newsletter along with fixes.
See Shamim Sharifuddin Pirzada's A Statistical Examination of The Evolution of the UNIX System for more information about the history of USG UNIX.