The 7 Best BSD-Based Operating Systems of All Time
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history - What proprietary AT&T code/features were removed in BSD Net1 (/2), and BSD 4.4 Lite (/2) from the original 4.3BSD codebase? - Retrocomputing Stack Exchange
The "HACKERS" Book 1996 Design & Implementation of the 4.4 BSD Operating System 9780201549799 | eBay