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Museum Folkwang Essen / ARTOTHEK

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Courtesy Metropolitan Museum, New York (Sabine Rewald)

Berlin, Archiv Wolfgang Wittrock

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Columbus Museum of Art

Archiv Eigentümer(in) / Owner’s Archive. Foto: Peter Schälchli, Zürich

Courtesy Metropolitan Museum, New York (Sabine Rewald)

Collection Albright-Knox Art Gallery, Buffalo, New York. Room of Contemporary Art Fund, 1950 (RCA1950:1). Foto: Tom Loonan