[8_hours_ago]

Don’t forget about the Dewey decimal system. For the books with ISBNs, you can sort them into boxes by their Dewey decimal. If you don’t have time manually categorize the books without ISBNs, they can be put into “other” boxes and left unsorted

[dredmorbius]

Library of Congress catalog information is more generally available, by ISBN if not already on the copyright page. For any conventionally published book since 1970.

http://eresources.loc.gov