Original 1st printing 23&7/8 x 24" psychedelic event poster for the 10/21/1967 March on (and attempted levitation of) the Pentagon in Washington, DC. This version of the poster ("A Ritual Exorcism") features a mandala incorporating beat poet/counterculture hero Allen Ginsberg, Uncle Sam, a peyote-eater and a skull. Artist unknown/not credited, medium-thin flat index stock poster is in used (B-) condition; moderate to heavy edge/surface wear (several edge tears, numerous nicks/dings), a pair of thin hard vertical folds traversing the image on either side of "Washington", a 1/2" chunk out of the top edge, scattered pin-prick age spots, pin/staple holes and tiny handling creases throughout... you get the idea. Still a very cool-looking psychedelic poster from one of the more unusual public gatherings of the day. Check out some home-shot 8mm color footage of the day (featuring Peter, Paul & Mary and the Bread & Puppet Theater);