Internet Archive (
https://en.wikipedia.org/wiki/Internet_Archive), and Open Library (
https://openlibrary.org/).
Probably not all the text on Internet Archive migh be high-res, btw.
@issybird: what I don't particularly like about Project Gutenberg, other than it having had books sold on Amazon, being taken from there, is that as them rewrite in digital a book, instead of scanning, I would not be that confident that "anyone" can translate or being that neat on.