Vintage poster, undated but from the late 50's or early 60's, from the BOSTON APPALACHIAN MOUNTAIN CLUB.  I have never seen any posters from them before, i just got two, the other is in another listing, no artist is created, on the funny side, with how to hike and leave the mountain as found.  COOL. just a bit of light edge wear, and some red color on the one side (see pics)