For reconstructing Unix history on a single repository [1], I'd need to represent the branches, merges, and chronological sequence of the late BSD releases (after 4.3). However, I've found on the internet some conflicting and simplistic information, so I'd welcome your input on how to straighten things up. First, consider this widely reproduced BSD family tree [2]. It has 4.4BSD-Encumbered derive from a line that includes Net/1, which was freely redistributable. Wouldn't it be clearer to create two branches, one with distributions free of AT&T code (4.3 BSD Net/1, 4.3 BSD Net/2, 4.4 BSD Lite1, 4.4 BSD Lite2) and one with full distributions (4.4 BSD, ...)? On which side would Tahoe and Reno stand? Also, the same tree [2] shows 4.4 BSD having as its ancestor 4.3 BSD Net/2, whereas another tree depicted on Wikipedia [3] has shows 4.4 BSD and 4.3 BSD Net/2 having as their ancestor 4.3 BSD Reno. What's the correct genealogy? Finally, I have a conflict with release dates. Wikipedia gives the following dates for Tahoe and Net/1 [4]: 4.3 BSD Tahoe June 1988 4.3 BSD Net/1 June 1989 However, looking at time-stamp of the newest files available under the corresponding directories in the CSRG CD-ROMs [5] I find the opposite order: cd2/net.1/sendmail/src/util.c 1989-01-01 12:15:58 cd2/4.3tahoe/usr/src/sys/tahoevba/vx.c 1989-05-23 13:47:43 What's the actual time sequence, and what's the corresponding genealogy? [1] https://github.com/dspinellis/unix-history-repo [2] http://ftp.netbsd.org/pub/NetBSD/NetBSD-current/src/share/misc/bsd-family-t… [3] https://en.wikipedia.org/wiki/File:Unix_history-simple.svg [4] https://en.wikipedia.org/wiki/Berkeley_Software_Distribution [5] https://www.mckusick.com/csrg/ Many thanks, Diomidis Spinellis PS Thank you all for the help you've provided so far.