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.