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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
History of the Berkeley Software Distribution - Wikipedia
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The Design and Implementation of the 4.4Bsd Operating System: Bostic, Keith, McKusick, Marshall Kirk, Karels, Michael J., Quaterman, John S.: 9780201549799: Amazon.com: Books
4.4BSD System Manager's Manual and 4.4BSD-Lite CD-ROM Companion | eBay
FreeBSD 1.0 | Linux Distros
CFT: OSCON 2012: Bring Back BSD
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9781565920927: BSD-Lite 4.4 CD-ROM Companion - Computer Systems Research Group: 1565920929 - AbeBooks
4.4 BSD-Lite | Details | Hackaday.io
The 7 Best BSD-Based Operating Systems of All Time