Enter a clue or pattern or both:
The Clue
Library ID (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
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
Copyright page info: Abbr.
Library cataloging datum, briefly
Publisher's 13-digit ID
0-198-61186-2, e.g.
Info on the reverse of a title page: Abbr.