I count 22 hardcover so that's what I voted - but I'm not sure if that's all you mean by "books". And limiting it to only d20 books does not give a fair or accurate account of my shelf contents. When you add in softcovers and splatbooks it instantly jumps into the mid-30's. When you add in modules it gets into the 40's. When you add in non-d20 and non-D&D rpg's the only one I still have is WEG's d6-system Star Wars RPG - but I bought a LOT of that so it get's into the low 70's with hardcovers, splatbooks, modules... When you add in OLDER D&D material that's not d20 I still have four 1E hardcovers on the shelf (the basic three and UA) and a fair pile of adventures. All the 1E/2E additional rulebooks and sourcebooks and adventures I have in three file boxes. That material would easily get me near 200 and THAT doesn't count all the stuff I sold off a few years ago, doesn't count my complete Dragon Magazine collection, etc. a few boxed sets I'm still hanging onto, etc.