ziqiqu

Nay, tell me how you class your wealth of books,
The drifted relics of all time. As well
sort them at once by size and livery:
Vellum, tall copies, and the common calf
Will hardly cover more diversity
Than all your labels cunningly devised
To class your unread authors.

George Eliot, Middlemarch, chapter 13.

My library will cross the 1000 mark soon.  And every book is indexed in a spreadsheet by title, author, genre, publisher, year — and IBSN number.