dmr posted to Usenet quite often over the years:
http://groups.google.com/groups/profile?user=research!dmr
http://groups.google.com/groups/profile?user=dmr@research.UU...
http://groups.google.com/groups/profile?user=dmr@alice.UUCP
http://groups.google.com/groups/profile?user=dmr@research.at...
http://groups.google.com/groups/profile?user=dmr@bell-labs.c...
http://groups.google.com/group/net.lang.c/msg/3651ddf298937d...
Well then, here are some of his first usenet posts: http://olduse.net/blog/Dennis_Ritchie/
The one on dsw is especially good.
SYNOPSIS (put number in console switches) dsw core
dmr posted to Usenet quite often over the years:
http://groups.google.com/groups/profile?user=research!dmr
http://groups.google.com/groups/profile?user=dmr@research.UU...
http://groups.google.com/groups/profile?user=dmr@alice.UUCP
http://groups.google.com/groups/profile?user=dmr@research.at...
http://groups.google.com/groups/profile?user=dmr@bell-labs.c...