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Hoffmann, George W.
"The DO-X part XXI: New York to Newfoundland." and "Part XXII: Newfoundland to Berlin, Germany
v. 45, no. 5, 1974, p. 140, 142-145; v. 45, no. 7, 1974, p. 222-225. See also "More on Newfoundland DO-X philately" by Cyril H.C. Harmer in v. 46, no.5, 1975, p. 162-163, 175.
Morin, Cimon. Canadian philately: bibliography and index. Volumes 1-3. 1979-1998. Reference 5769