There are some really good public domain #eBooks out there, so I've done a simple little search page for finding them:
https://switching.social/public-domain-ebooks-search/
Give it a go if you're a fan of classic #literature or #historical #texts.
Feedback welcome.
You can see the list of sources on the search results page, let me know if there's a source you think should be added.
I've tried to focus on books, especially literature, rather than academic papers or general archives.