[copperx]

Yep, I was really curious to see if he had finally given up and gone to TeX, Indesign, or the like.

I guess that if one's not dealing with a lot of math, groff is enough for many typesetting jobs.

I'm curious as to which version of groff they used. Heirloom groff? GNU groff? hmm...

[eric_the_read]

groff == GNU roff by definition. I suspect by "Heirloom groff" you mean troff or nroff.