Original 1st printing 14&1/8 x 20" concert poster for Chicago blues legend Howlin' Wolf appearing with Big Brother & the Holding Company (featuring Janis Joplin) at the Avalon Ballroom in San Francisco, CA on 9/23-24/1966 (*show canceled). Art by (and SIGNED in pencil by) Stanley Mouse (only) & Alton Kelley, image is # 27 in the Family Dog/Avalon series. Medium-thick flat vellum stock poster is in excellent (B+) condition; a few ultra-thin/well camouflaged handling bends around the edges, a pair of tiny pin holes in the top corners and the slightest hint of toning bordering the outer edges (matte shadow), otherwise fine. An overall FANTASTIC-looking SIGNED example of this classic Mouse/Kelley Family Dog image.