I've found the documentation for most of the
major
troff preprocessors and macros packages, but I can't
seem to find anything but occasional references to a
paper on the "Programmer's Memorandum Macros" (troff -mm)
by Smith and Mashey.
Try asking on the groff mailing list, they have been very active lately,
built a new macro package even.
groff(a)gnu.org
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Larry McVoy lm at
bitmover.com http://www.bitkeeper.com