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Aitken, John; Robert Lemire
Gumming varieties on Queen Elizabeth II envelopes
Postal stationery notes
v. 1, no. 1, 1981, p. 4
See also "ERP'S for gum varieties on the first Karsh issue envelopes" by John Aitken and Bill Walton in Postal stationery notes, v. 2, no. 4, 1983, p. 24-25.
Morin, Cimon. Canadian philately: bibliography and index. Volumes 1-3. 1979-1998. Reference 7648