Notes: No publication date in the book. WorldCat, OCLC 439880969 lists this publisher's edition of the book in 1961. But that record refers to an "Eagle Books" edition, which this is not. WorldCat lists no other Popular Library editions of this book. The appearance of an SBN number on this book implies a publication date of 1966 or later, as Popular Library appears not to have used it until then. Ads in the back of the book include books that don't exist until 1964, but none later than that, so it is likely that this edition was published in 1966.