12 September 1981 - Newspapers Protests in the Basque Country over the installation of Guernica in the Casón del Buen Retiro
New York, February 24, 1970 - Letter A letter from Walter Bareiss and Robert Von Berg to Wilder Green
New York, November 10, 1967 - Petition A Call for the Immediate Resignation of all the Rockefellers from the Museum of Modern Art’s Board of Trustees