Letter, 24 April 1975
Letter, 6 February 1974
Letter, 24 September 1974
Letter, 23 August 1974
Letter, 21 August 1974
Letter, 26 April 1974
Letter, 9 November 1973
Letter, 14 September 1973
Letter, 10 September 1973
Accession description, 26 April 1972