- excludes French language books,
- includes all variants and reprints,
- includes mass market paperbacks and digests but excludes pulps,
- excludes editions from Canadian branches of American publishers.
The number of titles is easier to count - 1300 +/- 25. The number of books including variants and reprints is 1825 +/- 75. Below are the first and last books in these counts.
Beaver nn - May 1941
Harlequin 497 - December 1959