Library of Congress CIP
If your title may attract library sales, and you are not a self publisher, and your book is not produced digitally on demand, a Cataloguing in Publication (CIP) number will facilitate its identification for librarians. Find information about this free service. The CIP number and summary tells librarians how to catalog your title and what topical categories your book may encompass.
The wait for a CIP number can be rather long so submit your title months before it’s ready for press.
The CIP number can only be issued before your title is produced and the information should be included on the copyright page.
Generally libraries prefer case bound books, and reference books need to meet specific library specifications for their manufacturing quality.
In general, you may not need the CIP number, but if your title qualifies, and you suspect some library interest, by all means apply (early) for your CIP information.