Citadel Paperbacks

The series numbering is confusing for this one, starting at first glance with C-62, Shaw's The Crime of Imprisonment. What I think actually happened is that the titles from C-62 through C-99 were probably Citadel back catalog titles that were either given their series numbers retroactively after the series began in earnest with C-100 or that were published in one go at the initiation of the Citadel Paperbacks line in 1961. The primary reason for this conclusion is that titles from C-63 to C-99 are in (albeit slightly incorrect*) alphabetical order. Shaw's Crime of Imprisonment is first, at C-62, for some reason. Maybe it was mistakenly left out of the alphabetical order or added later. Titles from C-100 on are all from 1961 or later and aren't arranged alphabetically, reflecting a more typical order of publication.

* Incorrect only because C-82 & C-83 (The Philosophy of Benedetto Croce and The Philosophers of China) and C-95 & C-96 (Therapy Through Hypnosis and Theories in Logic) are mistakenly out of alphabetical order.