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Canadian barrel cancels [Master list - early & late dates]
Barrel rollers bulletin
no. 1, 1981, p. 3-4
See also no. 3, 1982, p. 4; no. 4, 1982, p. 5; no. 5, 1982, p. 5-12; no. 8, 1983, p. 2-4; no. 11, 1986, p. 5-10; no. 14, 1988, p. 7-8;
Morin, Cimon. Canadian philately: bibliography and index. Volumes 1-3. 1979-1998. Reference 8821