The Unix War: Epilogue – A concise yet excellent anthology of the first 30 years of UNIX, detailing the birth of UNIX, the splintering/evolution into many “flavors”, and the happy ending. 🙂
You can download it from the following link: https://packetstormsecurity.com/files/download/14952/unix.war.is.over.txt
Source: https://packetstormsecurity.com/files/14952/unix.war.is.over.txt.html