> I have a book I bought last year that says first edition by the ISBN.
Be careful. The most collectable first editions are usually only the first impressions of the first edition, i.e., the first run of the printing press. There will often be later impressions, if the first one sells out, but the content of the book, including the ISBN, remains unchanged. The only difference will be the [printer’s key](https://en.wikipedia.org/wiki/Printer%27s_key) on the copyright page. A new edition involves typesetting the book afresh, typically with emendations or other changes, and that new edition will have a new ISBN, and a new printer’s key.
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