Museum Osthaus, Hagen. Foto: Achim Kukulies, Düsseldorf

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Courtesy Thomas Ammann Fine Art AG

Archiv Eigentümer(in) / Owner's archive

Mark Ranney Memorial Fund 1946.1 - University of Iowa City Museum of Art. Reproduced with permission from The University of Iowa

Courtesy Galerie Thomas, München

Kunsthalle Mannheim, Foto: Cem Yücetas

Nationalgalerie, SMB / Jörg P. Anders

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bpk / The Metropolitan Museum of Art