In part II I introduced a short-lived (1952-3) series of paperbacks from Avon Canada. Here's more about them.
The early numbers (at least to C762) in the series do not have a price on the covers. Later books have the price (35 cents) on both covers. All titles have “Printed in Canada” on the back cover and the copyright page. The Canadian subsidiary of American News Corporation (474 Wellington Street West in Toronto), the owner of Avon, is the distributor. The number on all books is on the top left front cover and lower spine.