Ten Books

Brendan at Untimately asks what ten printed RPG books would you keep if you could only keep ten?

I responded in the comments, but I'll say the same thing here.  Unknown Armies only has ten books in the set:

• Unknown Armies
• One Shots
• Lawyers, Guns, and Money
• Postmodern Magick
• Statosphere
• Hush Hush
• Weep
• The Ascension of the Magdalene
• Break Today
• To Go

Boom.  Done.  If I had to ditch all my pdfs, too, I'd just hack the Fuzzy Logic engine for whatever campaign I wanted to play.