B-SIDE: Once you've finished browsing the Grant-and-Campbell Bookman's branch, cross the street to Book Stop Used Books, 2504 N. Campbell Ave. This longtime Tucson fixture has a wide selection of well-chosen, well-organized tomes--good lit, biographies, fantasy and science fiction, cooking, travel, erotica, philosophy and some real unusual treasures besides. We especially like browsing some of the old classic paperbacks on the racks near the window while enjoying a scoop of McConnell's ice cream from the neighboring Santa Barbara Ice Creamery. The Book Stop a clean, well-lighted place where you can sit and browse for as long you'd like. Night owls will be happy to hear the store is open to 11 p.m. Monday through Saturday.