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The National Academies Press (NAP) publishes more than 200 books a year on a wide range of topics in social science, science, engineering, and medicine. Free PDFs by chapters or entire books can be downloaded. Use "Browse by Topic" for more specific results.
Open access e-books and journals. "Project MUSE promotes the creation and dissemination of essential humanities and social science resources through collaboration with libraries, publishers, and scholars worldwide."
The Open Research Library (ORL) is planned to include all Open Access book content worldwide on one platform for user-friendly discovery, offering a seamless experience navigating more than 20,000 Open Access books.
"HathiTrust is a partnership of academic and research institutions, offering a collection of millions of titles digitized from libraries around the world."
This cloud-based platform is not an open access one, but it offers eBooks and textbooks at affordable prices. Various price options for renting and/or "life-time" digital purchase depend on the book. Various eBook features and study tools are also available.
"Ideal for school-level and University students of Latin, and for anybody studying the language for the first time, these Open Access textbooks present extracts from major works including Ovid’s Metamorphoses, Virgil’s Aeneid and Tacitus’s Annals."
More than 6,500 Open Access eBooks from 85+ publishers, including Brill, Cornell University Press, De Gruyter, and University of California Press, are now available at no cost to libraries or users.
The titles in this ever-growing collection (200+) are free to view and download and cover subjects such as Anthropology, Film and Media Studies, Politics and International Relations, History, Education, Theology and Biblical Studies.
No account is required to be able to download the ebooks as PDFs from this site. If you cannot find a book from the library ebook collection, check this site; it provides books in theology and biblical studies too.
Open Library is a catalogue run by the non-profit Internet Archive. Open Library's goal is to list every book -- whether in-print or out-of-print, available at a bookstore or a library, scanned or typed in as text. You can borrow or read books after creating a free account.