The art of Wilhelm Lehmbruck (exhibition Washington, National Gallery of Art, 20.05.1972 - 13.08.1972 ; L.A., University of California, 20.09.1972 - 31.10.1972 ; San Francisco, Museum of Art, 15.11.1972 - 31.12.1972,...(et al)). - Heller, Reinhold (National Gallery of Art (Washington),, 1972)