Fiction: Dandelion Wine by Ray Bradbury (it's not sci-fi); Cannery Row or East of Eden by John Steinbeck; The Electric Acid Kool-Aid Test by Tom Wolfe (if you're looking for something a bit more eclectic)
Non-Fiction: Acid Dreams: The Complete Social History of LSD: The CIA, the Sixties, and Beyond by Martin A Lee and Bruce Shlain -- a fantastic social/cultural history book if you dig that kinda thing