What does it mean? There is no obvious connection with the publisher or imprint name. I believe the CD stood for Curtis Distributing Company of Canada, one of the largest wholesalers of magazines and paperbacks in Canada. The American parent was part of the company that published the Saturday Evening Post. Collins earliest distributors for the White Circles were American News Company east of BC and a local distributor in BC. Sometime in the mid 1940s Collins switched to Curtis.
White Circle 346 - 1948