Sometime in the past decade - probably about seven or eight years ago - WOTC decided to bring out miniature versions of various AD&D and D&D books. I picked up the three core books for AD&D 1st Edition. I kept them in my desk in grad school, apparently hoping for the spontaneous lunch session game with my fellow grad students (didn't happen).
They languished as I stopped gaming altogether during my dissertation writing period, and eventually sat in a box, altogether forgotten. Then, just the other day, I ran across them again as I was searching for something else. Despite the micro-miniature font size (a magnifying plastic ruler took care of that), I found myself thinking "hey, if you needed gaming supplies for a bug-out bag, these would be great!" Sanity slowly returned, and I got to thinking about them, and an internet search revealed this (scroll down to see the entire set).