- Lost Unix v4 source code from 1973 recovered from decades-old magnetic tape TechSpot
- UNIX V4 tape successfully recovered: First ever version of UNIX written in C is running again theregister.com
- Unix v4 clawed back from a 1970s tape Fudzilla.com
- 52 years later, UNIX V4 has been rediscovered and digitized Yahoo! Tech
- Archivists Rediscover 1974 Bell Labs Unix Tape, Preserving OS History WebProNews
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