Catalog of U.S. Government Publications (CGP) The CGP is the finding tool for federal publications that includes descriptive records for historical and current publications and provides direct links to those that are available online. Users can search by authoring agency, title, subject, and general key word, or click on "Advanced Search" for more options.
The catalog also offers a federated, or aggregated, search feature called (MetaLib) that allows searching of up to 10 government databases simultaneously
Science Accelerator http://www.scienceaccelerator.gov
Searches 12 databases of energy-related research
Searches 42 databases covering all fields of science but also more than 2,000 selected websites.
WorldWide Science.org (http://worldwidescience.org)
Searches 76 databases or portals from 65 countries and includes a translation feature for help with foreign language materials.