Letter, 15 December 1972
Letter, 9 January 1973
Letter, 11 January 1973
Letter, 15 January 1973
Letter, 24 January 1973
Letter, 21 March 1973
Accession description, 26 April 1972
Letter, 10 September 1973
Letter, 14 September 1973
Letter, 9 November 1973