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.