9 catalogs on Saarland art, Fritz Zolnhofer "Malerei und Graphik", Saarland-Museum Saarbrücken 1970, Günter Schwarwath "Miniaturen zur Kunst- und Kulturgeschichte der Saarregion", Verlag "Die Mitte" Saarbrücken 1999, Albert Weisberger "Grenzgänger zwischen Tradition und Moderne", Museum St. Ingbert 2003, "Helmut Collman", exhibition in the Kulturhaus St. Ingbert 1977, H. Reuth "Das schöne Land an der Saar", 64 pictures, Saarbrücken 1928, Hans Leyser "Saarländischer Künstlerbund 1968", Saarbrücken 1968, two catalogs on Walther Weis, plus a catalog of the Moderne Galerie Saarbrücken 1976, various ins. covers, signs of age and wear, 4351 - 0004

Composed of several subsidiaries, the Drouot Group is a major player in the art market. Hôtel Drouot, located in the heart of Paris, has been the world's largest public auction center since 1852. 15 salerooms are available to more than 70 auction houses. The emulation generated by an annual offer of 230,000 artworks from 21 major specialities - from Antiquity to street art - attracts some 3,000 visitors every day. The Group's digital platform, Drouot.com, offers digital sales - Live auctions (live broadcasting and participation in auctions), Online-only auctions (dematerialised auctions) and Buy Now sales (sales of lots at fixed prices). Nearly 2 million items are offered annually by 600 auction houses. Auction news is reported every week in La Gazette Drouot, the leading weekly magazine for the art market and culture published by Auctionspress.