Internet Archive -Includes fiction, historical texts and academic books.
Project Gutenberg - Includes works from the classical era into the 1900s. Many primary sources and reference works.
Perseus Digital Library - large digital library of primary source works in history, science, and the humanities. The primary collectioncovers the history, literature and culture of the Greco-Roman world.
Combined Arms Research Library Digital Library - includes ebooks from the School of Advanced Military Study, Masters theses, operational documents from various wars and more.
HathiTrust - Millions of digital books, journals, government documents, and other volumes, from research libraries. Both public domain and in-copyright works across a full range of subjects are included. All items are discoverable, but viewability depends on each individual items copyright status. You mssay also search OhioLINK Catalog for Hathi Trust resources.
University independent digitization projects: