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I looked up on a book via Anna's Archive, which has an impressive collection of books and papers. This one, though, was hand-scanned, possibly, via phone camera.
Every single page has the scanner's thumb on it.
On one hand (ha!), I'm impressed by their commitment and dedication. On the other, I don't want to know about this topic badly enough to be able to ignore the thumb. Also, the double-page layout is going to be awkward on my tablet.
All that said, it is great that this shadow library exists!