E.S. Willbourn, Geological Survey Department, Federated Malay States, 22 August 1939-30 October 1939 Date: 1939-08-22/1939-10-30
E.S. Willbourn (Geological Survey Dept., FMS), 27 June 1933-13 April 1934 Date: 1933-06-27/1934-04-13
Extract from Part 4 District of Blackall, Central Queensland. (3p.), 01 December 1923-15 December 1923 Unit ID: 4 Date: 1923-12-01/1923-12-15