New York, 10 March 1955
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Institutional correspondence
Archived in
- Musée National Picasso-Paris, Fonds Picasso 19
- Museum of Modern Art Archives, New York 10
- Roland Penrose Archive, Scottish National Gallery of Modern Art Archives, Edinburgh 2
- Arquivo Histórico Wanda Svevo/Fundação Bienal de São Paulo 1
- Biblioteca y Centro de Documentación, Museo Nacional Centro de Arte Reina Sofía 1