MARIËN (Marcel). Trouble head. Brussels: Les Lèvres nues, [1988]. - In-12, in sheets. First edition illustrated with 7 black photographs of collages of the poet-artist, reproduced in the text and on full page. Autograph letter signed on the back cover: " For Lo Duca // which I was happy // to notice with my own eyes // the existence // M. M. " Copy very well preserved. Joint : - Brochure-catalogue for the exhibition dedicated to Marcel Mariën at the Saint-Laurent gallery in Brussels, which was held from December 16, 1967 to January 11, 1968. - Mesens. Catalog of the Mesens exhibition that took place in July and August 1963 during the XVI Belgian Summer Festival in Knokke-le-Zoute. Text by Jacques Brunius. Frontispiece in colors and reproductions in black in the text. - Bourgeois (Louise). Invitation (2 ff. in-8) to the opening of the Louise Bourgeois exhibition on October 15, 1991 at the Robert Miller Gallery in New York. It is illustrated with two beautiful photographs in black. Autograph letter signed by the artist on the second page.