Sohm, Hanns. Happening & Fluxus: Materials. Cologne: Köelnischer Kunstverein, 1970, first edition. Wraps, 6 by 9 1/8-inches, not paginated (336 pp). Very light wear to corners and edges, no spine creases. A stunning exhibition catalogue for a show at the Köelnischer Kunstverein from November 1970 to January 1971 which, after a short introduction in German, reproduces flyers, advertisements, publications, multiples, photographs, and works of art from the start of Fluxus through the late 1960s. The act of creating, en masse, a collection of Fluxus documents has created, in turn, a Fluxus work of art. First Edition.