Peter Roehr Untitled (OB-34) 1966 Collage of cardboard on cardboard 9 7/8 × 9 7/8 in. Peter Roehr. Werke aus Frankfurter Sammlungen. Frankfurt am Main, Städel Museum; MMK Museum für Moderne Kunst, ill. p. 122 (only exhibited at Städel Museum) / Peter Roehr. Berlin, Grisebach, 2016, ill. p. 13 Private Collection, Hesse