MetaLib – Federated Catalog of U.S. Government Publications Search Engine
http://metalib.gpo.gov/

MetaLib is a service of the Catalog of U.S. Government Publications (CGP)! MetaLib is a federated search engine that searches multiple U.S. Federal government databases, retrieving reports, articles, and citations while providing direct links to selected resources available online. This has been added to the tools section of Research Resources Subject Tracer™ Information Blog. This will be added to Academic and Scholar Search Engines and Sources White Paper.