Brussels, 14 May 1956 - Institutional correspondence A letter from the Spanish ambassador in Belgium to Alberto Martín-Artajo Álvarez
Hollywood, 21 October 1939 - Institutional correspondence H. Heyman's and G. E. Scheyer's letter to Sidney Janis
9 November 1952 - Newspapers Excellent Paintings Displayed in exhibition of Harrison-Berne; Museum Showing Picasso Prints