publicdomainreview.org
Public Domain Review helps search books, ebooks, papers, library records, or reading archives.
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gutenberg.org
Free ebook library offering public-domain books, classic literature, and downloadable texts.
dhushara.com
Dhushara Research helps search books, ebooks, papers, library records, or reading archives.
shadowlibraries.github.io
Guide and directory covering shadow libraries, mirrors, access methods, and book-search resources.