History of BSD

Here is an editorial that Daemon News has entitled What every Linux user needs to know about BSD.
http://ezine.daemonnews.org/199904/editorial.html

John Sokol's Presentation to Local Silicon Valley Clubs.
http://www.dnull.com/bsd/sokol_BSD_talk/bsdtalk_files/frame.htm

386BSD Historical Items as collected by John Sokol.
http://www.dnull.com/bsd/

An Incredibly Accurate Accounting of BSD. by Éric Lévénez
http://www.levenez.com/unix/

Wolfram Schneider has a nice tree listing that ships with all FreeBSD machines.