Groff docs: where to get?

[Rob Lingelbach]

I recently installed groff & gtroff versions 1.0, and would like to
know how they differ from nroff and troff; the man page is inscrutable
on this.  I have a book on Unix text processing that will teach me
nroff, but I don't know how much is common ground between it and groff.
Can anyone clarify this for me?
Thanks.


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