(1) W. Sandberg. Anton Heyboer. Geh durch den Spiegel
Galerie der Spiegel, Köln, 1960. 34 p. Pictorial paper-covered boards designed by Heyboer. Folio (38 x 26.5 cm) One of 200 copies. Incl. 2 (one folding) col. etchings. With: Lithographic catalogue poster of the Anton Heyboer exhibition at the Stedelijk Museum Amsterdam, 1958. Cat 182. Folding with text on verso.
Added: Henri Michaux. Oeuvres récentes 1959-1962. Galerie Daniel Cordier, Paris, 1962. (total 5)