The book itself
Record the binding, edition, printing, signature, and any special-edition details.
The paperback you carry around and the hardcover you keep at home can share a title without sharing a record.
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Record the binding, edition, printing, signature, and any special-edition details.
A creased spine, a missing jacket, a name inside. Keep the details you would want to check before buying another.
Save the shop, date, and price. Add a note about the find and the shelf where it now lives.

Start with a title and fill in the rest later. Unknown edition and printing numbers can stay blank. Each physical copy counts toward your collection.