archive.org
Internet Archive text collection for finding scanned books, documents, magazines, and public texts.
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dhushara.com
Dhushara Research helps search books, ebooks, papers, library records, or reading archives.
gutenberg.org
Free ebook library offering public-domain books, classic literature, and downloadable texts.
shadowlibraries.github.io
Guide and directory covering shadow libraries, mirrors, access methods, and book-search resources.