How to catalog books without ISBNs
The absence of one identifier does not prevent you from making a reliable record.
Start with the book, not with the empty ISBN field.
Record the title and responsible person from the title page, then look for the publisher, date, edition statement, and other clues elsewhere in the book. Search library catalogs using several of those details together, and keep the record manual if no match is convincing.
Why some books have no ISBN
The ISBN system developed from a UK book-numbering system introduced in 1967 and became an international standard in 1970. Books published before ISBNs came into use will not have been assigned one as part of their original publication.
A newer book may also lack an ISBN because the publisher did not assign one or because the publication falls outside the publisher workflows where ISBNs are commonly used. Do not infer an ISBN from a similar-looking edition.
Begin with the title page
The cover and spine help you recognize a book, but the title page is the better starting point for the title, subtitle, author, editor, translator, and publisher wording. Library of Congress cataloging material treats the title page and copyright page as core sources for describing a book.
TITLE: The Thirty Years War AUTHOR: C. V. Wedgwood PUBLISHER: Jonathan Cape PLACE: London YEAR: 1938
This is an illustrative record shape, not a claim about a particular copy. Preserve the wording found in the book in hand.
Then check the copyright page
The page behind the title page often carries publication history, copyright dates, edition or printing statements, identifiers, and Cataloging-in-Publication data. It can resolve details that the title page leaves unclear.
Use publisher, year, and edition clues together
A title and author may identify the work but not the version in your hands. Add the publisher or imprint, place of publication, stated year, format, translator, illustrator, series, and any explicit edition or printing statement.
What about SBNs?
Some books from the transition into ISBN use may show a nine-digit Standard Book Number, or SBN. The ISBN system grew out of that earlier scheme. An SBN can be a useful search clue, but preserve it as printed and verify any converted ISBN against a reliable catalog record before treating the numbers as equivalent.
What about an LCCN?
A Library of Congress Control Number can help you locate a Library of Congress bibliographic record. It is not another form of ISBN: the Library of Congress states that the LCCN controls the catalog record, not the book itself.
If an LCCN is printed in the book, search it in the Library of Congress catalog and compare the resulting title, publisher, date, and physical description with your copy. A matching record is useful evidence, not a reason to ignore differences in the book you hold.
Matching older editions
Search by title and author first, then narrow with publisher, year, place, translator, or edition wording. Compare the candidate record field by field. Pagination, illustrations, dimensions, and series information can help when several records remain plausible.
TITLE: matches AUTHOR / EDITOR: matches PUBLISHER: matches YEAR: matches EDITION STATEMENT: matches PAGES / FORMAT: plausible
One mismatch may have an explanation. Several mismatches usually mean you found a different edition.
When manual cataloging is the right answer
Sometimes no database has the right record. Sometimes several records are too vague to distinguish. In either case, a careful manual record is better than a confident link to the wrong edition.
Record what you can verify from the book, leave uncertain fields blank, and add a note about anything unresolved. The page on which home-library catalog fields to track can help you decide what the record actually needs.
Sources
- International ISBN Agency — Standard Book Numbering turns 50
- Library of Congress — Preassigned Control Number FAQ
- Library of Congress — Cataloging-in-Publication data
- Library of Congress — Core materials for cataloging