<publication> "Source Code and Commentary on Unix level 6", by
John Lions.
The two parts of this book contained the entire source listing
of the Unix Version 6 kernel, and a commentary on the
source discussing the algorithms. These were circulated
internally at the University of New South Wales beginning
1976-77, and were, for years after, the *only* detailed kernel
documentation available to anyone outside Bell Labs.
Because Western Electric wished to maintain trade secret
status on the kernel, the Lions book was never formally
published and was only supposed to be distributed to
affiliates of source licensees (it is still possible to get a
Bell Labs reprint of the book by sending a copy of a V6 source
licence to the right person at Bellcore, but *real* insiders
have the UNSW edition). In spite of this, it soon spread by
samizdat to a good many of the early Unix hackers.
