New York, 9 September 1981 - Institutional correspondence An internal letter from Richard E. Oldenburg to staff at the Museum of Modern Art, New York
Zurich, 12 December 1955 - Institutional correspondence A letter from Klaus Herdeg to Willem Sandberg
New York, 24 March 1980 - Institutional correspondence A letter from Richard Oldenburg and William Rubin to Javier Tusell
1939 - Institutional correspondence Correspondence between the Spanish Refugee Relief Campaign and Alfred H. Barr Jr.
1939 - Internal institutional documents A list of possible donors to the Spanish Refugee Relief Campaign
Los Angeles, 1939 - Invitation Invitation to the opening of the exhibition Picasso's Masterpiece. Guernica and 63 Related Paintings and Drawings at the Stendahl Art Galleries
1939 - Internal institutional documents A list of museums and directors to which the Spanish Refugee Relief Campaign offers participation in the tour of Picasso's Guernica