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AbeBooks
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WorldCat
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Hathitrust
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Perlego
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https://www.vialibri.net/ (and then https://www.alibris.com/)
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unpaywall
marginalia.nu
before:<date> tag in google search
list of non-subscription in here
one of which is
https://bestbets.org/database/browse-bets.php
https://bestbets.org/bets/bet.php?id=31
only goes up to about 2006, as far as I can see. nice idea though.
I’m loving biblio. ordered a bunch of textbooks, they’ve all been great, and the prices are phenomenal.