Dungeonosophy
Legend
Yesterday I met with Bill Wilkerson, one of the players from Tom Moldvay's and Lawrence Schick's original Known World campaign (c.1976-1979), and we scanned the entire set of his Moldvay-era OD&D house rules, along with Bill's overview of the Imirrhosian Continent, upon which TSR based their Known World of Mystara.
Furthermore, Shannon Appelcline (from Designers & Dragons) kindly reformatted the materials into OD&D booklets!
Piazza post: Bill Wilkerson's Original Known World documents (now in OD&D booklet format!) - The Piazza
Google Drive files: Bill Wilkerson's Original Known World documents - Google Drive
Furthermore, Shannon Appelcline (from Designers & Dragons) kindly reformatted the materials into OD&D booklets!
Piazza post: Bill Wilkerson's Original Known World documents (now in OD&D booklet format!) - The Piazza
Google Drive files: Bill Wilkerson's Original Known World documents - Google Drive