- The Exhibition of the South African Colonies
- London Philatelist
- vol. 11, no. 132, December 1902, pp. 280-81
Discusses the five Post Office stamps on display at the Exhibition of the South African Colonies, held in London in December 1902. These included Henry Duveen's two, Sir William Avery's two, and the Earl of Kintore's ball envelope (the Duvivier envelope).