Europeana - A digital repository focused on European cultural heritage. Searches and links to digital items, including images, texts, sounds, and videos.
Hathi Trust - Partnership of research institutions and libraries that makes available in a digital format public domain books and pamphlets within their collections.
Internet Archive - Digital multimedia collection of public domain works. Includes copies of print works, video, and audio resources. Also allows limited exploration of archived websites from around the Internet.
World Digital Library - The WDL makes available significant primary materials from 192 countries and cultures. Bibliographic information and content descriptions are provided in seven languages: Arabic, Chinese, English, French, Portuguese, Russian, and Spanish. Resources include books, manuscripts, maps, newspapers, journals, prints and photographs, sound recordings, and films.