Left my copy of Southern California Bouldering Guide by Craig Fry at Horse Flats on Tuesday night. Gettin' dark, sent my "proj" (ha!), and we rallied out of there and forgot the guidebook. Its at the main bouldering area, right next to a water bar on a smooth boulder just off the trail (and a nice spot to shoe up). Right below the popular boulder with two 5.8's on either end, facing the trail.