Dungeons & Dragons White Box
TSR Rules
Original D&D (1.0)
Monsters & Treasure
Gary Gygax
Greyhawk.pdf
Dungeons & Dragons - Book III: The Underworld & Wilderness Adventures
Gary Gygax & Dave Arneson
Blackmoor.pdf
Dave L. Arneson
Supplement 4 - Gods, Demi-Gods & Heroes.pdf
Robert J. Kuntz
Eldritch Wizardy.pdf