Spirit of an Age : : Nineteenth-Century Paintings from the Nationalgalerie, Berlin (exhibition London, National Gallery, 8.3 - 13.5.2001 ; Washington, National Gallery of Art, 10.6 - 3.9.2001) / / Françoise Forster-Hahn, Claude Keisch, Peter-Klaus Schuster...[et al] ; With contributions by Christopher Riopelle, Birgit Verwiebe.boek