UNIX Family Tree?

[Steve Campbell]

I'm confused by all the different flavors of UNIX that people talk
about: V-this, System-that, the-other-BSD.  Would someone like to
enlighten us all by composing a family tree of UNIX's?  Start with
MULTICS if that's appropriate and show how all the different versions
evolved.  Footnotes about the major differences would be nice, too.

				Steve Campbell
				{decvax|linus|dalcs}!dartvax!steve