Dennis Ritchie has unearthed the on-line manuals for 3rd Edition UNIX, and they are in v3mans.tar.gz. His email says: It turns out that the source ?roff for the 3rd and 4th edition manuals exists online here. These are versions from bowell, which Norman Wilson will remember, and are all owned (according to the bowell passwd file) by andrew (Hume). The Plan 9 file date marks (inherited, probably faithfully, from bowell, and most probably faithfully from whatever tape Andrew loaded) are in the range around Feb 1973 for the 3rd edition, and Nov 1973 for the 4th. The dates inside the files themselves are consistent with this. This was clearly a feverish period. The manual pages are only a few months apart, but besides all the system changes, the manual was redone from nroff to troff, which appeared in the 4th and not the 3rd. Ah, the energy of youth.