Courtesy Villa Grisebach, Berlin
Archiv Eigentümer(in) / Owner's archive. Foto: Maurice Aeschimann
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Collection Walker Art Center, Minneapolis. Gift of Mr. and Mrs. John Cowles, Sr. 1964
Courtesy Thomas Ammann Fine Art AG
Archiv Eigentümer(in) / Owner's archive
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Washington D. C., Smithsonian Institution, Hirshorn Museum and Sculpture Garden. Gift of the Joseph H. Hirshhorn Foundation, 1966. Foto: Lee Stalsworth