Enter a clue or pattern or both:

The Clue

Library ID (4 letter answer)

The Answer




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.