troff documentation

generic documentation

troff

preprocessors and other stuff

fonts

UNIX™ System V – Documentor’s Workbench

Documenter’s Workbench™ (1983 edition)

Documentor’s Workbench™ (1989 edition)

Note the name change from Documenter’s Workbench to Documentor’s Workbench

Apple A/UX®

A/UX® Text Processing Tools