Here’s an enormous library of thousands of old book illustrations, with searchable name, artist, source, date, which book it was in, etc. There are also a number of collections to browse through, and each are tagged with multiple keywords so you can also get lost in there in that manner.
Though the team behind the site doesn’t specifically list the whole site as public domain, chances are a lot of the illustrations you’ll find are way out of copyright in most jurisdictions.
bluesyemre 
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