Original first printing for a 1970 concert held at the Aragon Ballroom Chicago Illinois. Featured were Country Joe & the Fish, Shocking Blue, Pacific Gas & Electric, Amboy Dukes and Ambergris. The poster is in very nice condition with minor roll creases, light toning mainly on back side, and tiny edge dings on the left side (see pictures). Art by Laura Green.. Featured in the Art of Rock plate 4.208. 17 1/2″ x 22 1/2″.