Enter a clue or pattern or both:
The Clue
Copyright page info: Abbr. (4 letter answer)
The Answer
ISBN
Tags
Notes
The answer ISBN is uncommon, appearing about once every 575 puzzles.
Related Clues
Amazon fig.
Amazon.com ID
ID in a library
Library ID
Novel ID
Publisher's ID
Bibliophile's citation, for short
Card catalog abbr.
ID on a dust jacket
ID in a library vol.
Novel figure: Abbr.
13-digit library info
978-0060935443, for Roget's Thesaurus
Abbr. on the back of a title page
Library cataloging datum, briefly
Publisher's 13-digit ID
0-198-61186-2, e.g.
Info on the reverse of a title page: Abbr.