J.S. Read (London) re NSW emeralds (4p), 09 January 1892-15 November 1892 Date: 1892-01-09/1892-11-15
J.W. Edgeworth David (Sydney University and London), 10 December 1910; 22 January 1911; 19 February 1911; 9 August 1911 Date: 10 December 1910; 22 January 1911; 19 February 1911; 9 August 1911
J.W. Gregory (University of Melbourne; Quorn, WA; University of Glasgow, London), 22 April 1901-07 April 1909 Date: 1901-04-22/1909-04-07