In 1981, 13-year-old Gaius Stern wrote and illustrated The Habitition of the Stone Giant Lord (link opens in new tab/window) in imitation of TSRs Dungeons and Dragons adventure modules. The Habitition is a true labor of love, typed and drawn as a DIY addition to the Against the Giants series of modules, part time capsule and part outsider art.
Dungeon Crawl Classics: Dying Earth #9: Time Tempests at the Nameless Rose
The Chronicles of Future Earth Player's Guide (Hardcover) + complimentary PDF (via publisher)
Song and Silence: A Guidebook to Bards and Rogues - D&D 3.5 [Pre-Owned]