SPECIAL Sottections Whitehead, Alfred, 4.1974. *scc The squared circle postmarks of Canada; 2d
~P959 ed. Brampton, Ont., British North American .W58S Philatelic Society, 1959.
56p. illus. 23cm.
1. Cancellations (Philately )--Canada. 2. Postmarks--Canada. I. Title.