Created through a partnership between NASA and the Internet Archive, NASA imagines offers public access to NASA's image, video, and audio collections in a single, searchable resource.
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As of June 2, 2011, all PDF versions of books published by the National Academies Press are downloadable to anyone free of charge.
The National Ocean Service (NOS) studies, monitors, and protects coastaland marine areas in the United States.
19th Century Collections Online is a multi-year global digitization and publishing program focusing on archival collections of primary sources providing full-text, fully searchable content.
With Merriam-Webster's Visual Dictionary Online either search ideas within organized subject fields to quickly locate more than 20,000 terms with full definitions or consult over 6,000 illustrations of a wide variety of objects from all aspects of life.