Player's Guide to the Hyborian Age
Mongoose Publishing
Call of Cthulhu
An Inner Darkness
Pandemonium - Scorn
The First Book of Pandemonium (10th anniversary edition)
Complete Dungeon of the Bear
Unknown
Enemies and Allies
Bruce R. Cordell & Jeff Grubb & David Noonan & and Skip Williams
Manual of the Planes
Jeff Grubb