All of the materials found through DPLA—photographs, books, maps, news footage, oral histories, personal letters, museum objects, artwork, government documents, and so much more—are free and immediately available in digital format.
One of the oldest and most famous online book collections. Most of the items the collection are the full texts of public domain books.
HathiTrust is a partnership of academic & research institutions, offering a collection of millions of titles digitized from libraries around the world. Select 'Advanced Search' to search by format type; select 'Full-Text Only' to retrieve Open Access content.
A digital library of Internet sites and other cultural artifacts in digital form; provides free access to researchers, historians, scholars, the print disabled, and the general public.
The National Academies Press (NAP) publishes the reports of the National Academies of Sciences, Engineering, and Medicine.