Carl Grossberg, Boiler room 1924 Dated and signed lower left: 1924 CARL GROSSBERG. On the cardboard backing a label of Galerie Valentien, Stuttgart, Galleria Milano, Milan, as well as the exhibition London 2007 (see below) 45,9 × 37,5 cm Pencil on paper Carl Grossberg 1894-1940. Bilder von Architektur und Industrie der zwanziger und dreissiger Jahre. Munich, Galerie Michael Hasenclever, 2006, cat. no 3, ill. / Lonely Prophets. German Art from 1910–1930. London, Agnew´s and Daniella Luxembourg Art, 2007 (acc. to label on the backing)