Pan and White Circle Part I

I recently began a series of posts on titles published by both Penguin and Harlequin. Here's another British and Canadian publishing pair - Toronto's Wm. Collins & Sons and Co. Canada Ltd. (White Circle) and London's Pan Books. How many titles were published by both companies? Not sure yet.

White Circle 211 - 1944

White Circle 244

Pan 40 - 1948

Pan 40 back