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Simpson, William L.; Bill Arfken
The five cent large queen - Papers and perforations
v. 49, no. 5, 1992, p. 12-14
See also article 'Kiusalas gauge measurements' by R. D. Leith in BNA topics, v. 50, no. 3, 1993, p. 25.
Morin, Cimon. Canadian philately: bibliography and index. Volumes 1-3. 1979-1998. Reference 6475