3 April 1939 - Minutes Minutes from a meeting of the Executive Committee of the Spanish Intellectual Aid, dated 3 April 1939
Paris, 5 December 1955 - Institutional correspondence Maurice Lefebvre-Foinet's letter to Willem Sandberg
24 March 1939 - Minutes Minutes from the meeting of the Executive Committee of the Spanish Intellectual Aid Association, dated 24 March 1939
30 March 1939 - Minutes Minutes from a meeting of the Executive Committee of the Spanish Intellectual Aid Association, dated 30 March 1939
Barcelona, 4 February 1938 - Institutional correspondence Correspondence regarding the organisation of a Picasso exhibition in the USA