Our reference category contains over 30 subcategories on a wide range of reference material and resources by subject and is arranged in an easy to search index of quality sites. If you need a quick reference you can find it here.
Library of Congress
The Library of Congress is the nation's oldest federal cultural institution, and it serves as the research arm of Congress. It is also the largest library in the world, with more than 120 million items. The collections include books, sound recordings, motion pictures, photographs, maps, and manuscripts.
http://www.loc.gov - Read more