Paris, 10 February 1955 - Institutional correspondence Daniel-Henry Kahnweiler's letter to Alfred H. Barr Jr., dated 10 February 1955
Mainz, 2 May 1956 - Institutional correspondence J. Mougin's letter to François Mathey, dated 2 May 1956
Paris, 14 March 1956 - Personal correspondence Daniel-Henry Kahnweiler's letter to Pablo Picasso, dated 14 March 1956
April, 1987 - Photograph Graffiti in Biscay with the message Euskadi libre ("Free the Basque Country")
Old Westbury, New York, 4 May 1977 - Institutional correspondence Emilia Doyaga's letter to Nelson Rockefeller
Hamburg, 30 March 2015 - Photograph Visitors in front of Guernica Redacted (After Picasso's Guernica, 1937) , by Robert Longo
9 June 1988 - Newspapers Spain's Ministry of Culture rules out the transfer of Picasso's Guernica to Biscay