Josep Lluís Sert (the architect who designed, with Luis Lacasa, the Spanish Pavilion at the Paris International Exhibition of 1937), writes to Pablo Picasso from New York to talk about the reception of the exhibition Picasso: Forty Years of His Art at the Museum of Modern Art in New York and its impact, given the opening was attended by Alexander Calder and the Larreas.

Reference in the source Archive:
Josep Lluís Sert's letter to Pablo Picasso, dated 20 November 1939