Original 1st printing type A (no credit, silver background) 13&3/4 x 19&7/8" conference/event poster for the Sierra Club's 10th Biennial Wilderness Conference held at the Hilton Hotel in San Francisco, CA on 4/7-9/1967. Art by Stanley Mouse and Alton Kelley, image is featured in the Art of Rock book on page 239 (plate 2.365). Medium flat vellum stock poster is in decent (B-) condition; tack holes/wear in all four corners a bit of fraying and a tiny area of paper loss in the top left margin, a few scattered surface dings and a stray couple of white paint spots in the left margin, toning, a 1&1/2" tear in the left center margin and a pronounced curl to the paper (it was rolled up in a tube for many years), BUT this particular example comes from an original '60's-era collection of undeniable provenance. While not a perfect example, this one would probably look fine framed up. One of Mouse/Kelley's classic non-rock images from early 1967.