The Library of Congress (LOC) recently joined the Science.gov Alliance. The nation's oldest federal cultural institution and largest library in the world, the LOC serves as the research arm of Congress with millions of books, recordings, photographs, maps and manuscripts in its collections. The addition brings the Science.gov Alliance membership to 17 organizations . Currently in its fourth generation, Science.gov provides search of more than 50 million pages of science information with just one query, and is a gateway to over 1,800 scientific Web sites and 30 deep Web databases.