Tewligan
First Post
As in the Wilderness Survival Guide and Dungeoneer's Survival Guide?1E Survival guides

However, 1e DMG? Best. Book. EVER.
As in the Wilderness Survival Guide and Dungeoneer's Survival Guide?1E Survival guides
If we're counting D&D-like OGL, I'll add in Arcana Evolved. Great setting, and mechanics that tied in with the flavor. It gets severe balance issues with casters/non-casters past about 11th level or so, but that does little to dampen my love for it.
-O
World Builder's Guidebook, maybe?
The 1e Manual of the Planes
World Builder's Guidebook
Planeswalker's Handbook (most of that was too good to exist in just PS)
AllisterH said:DRAGON CD-rom - There's a reason why this goes for so much on ebay...
Van Richten's Guides (Esp Vampires and lycanthropes)
The 1E and 3E Manuals of the Planes are awesome, as is the 2E Planescape box set.