They also share paperback publishers. In an earlier post I discussed Leacock's Literary Lapses, published by Wm. Collins Sons & Co. Canada Ltd and McClelland & Stewart. Niven's The Flying Years was also published as a Collins's White Circle and a M&S New Canadian Library.
The first WC edition was one of the initial 50 published in 1942. A second edition was published in 1944 and then reprinted the next year. The NCL edition came 30 years later in 1974. This book demonstrates some of the sloppy work often seen in the NCL series. The copyright page states the book was originally published in 1942, not the correct 1935. The back cover notes 1935 as the "written" date, not the publishing date. The text is printed (poorly) from the Collins WC edition of 1944 rather than being reset.
The WC edition was discussed in an October 10, 1942 Globe & Mail story titled "White Circles". The article starts with "Canadian-made reprints of books of proven popularity mean a long step forward in local publishing" and the last paragraph says "there are plenty of other titles; new ones are being added fast, and copies are being absorbed by the public in very large quantities." The article is unsigned but likely W. A. Deacon.
White Circle - 1942
White Circle 1942 back cover
White Circle 116 - Margaret Paull artist
White Circle 116 back cover
New Canadian Library 102
New Canadian Library 102 back cover