Geological Congress, Montreal, 1972
Letter, 26 May 1972
Letter, 6 June 1972
Letter, 7 August 1972
Letter, 3 October 1972
Letter, 26 October 1972
Redpath Museum closing, 1971, Phoenix Natural History Association, 1981-1982
letter, 25 August 1971
Letter, 25 November 1971
Letter, 9 December 1971