Federated search portals search multiple catalogs with a single query. It is often useful to search within well-defined categories of items. These portals are listed from the most local to international in scope.
National Technical Reports Library
National Technical Reports Library (NTRL) is the search database of the National Technical Information Service (NTIS) based on U.S. Government-sponsored research results. It is sponsored by the U.S. Department of Commerce and offers free public access to a database of over three million federal science and technology reports.
SciTech Connect
SciTech Connect is your connection to science, technology, and engineering research information from the U.S. Department of Energy (DOE) Office of Scientific and Technical Information (OSTI.) OSTI collects, preserves, and disseminates DOE-sponsored R&D results that are the outcomes of R&D projects or other funded activities at DOE labs and facilities nationwide and grantees at universities and other institutions.
Science.gov
Science.gov is your gateway to U.S. federal science. Science.gov searches over 60 databases including SciTech Connect, NTRL and over 2200 other selected websites from 15 federal agencies, offering 200 million pages of authoritative U.S. government science information including research and development results.
WorldWideScience.org
WorldWideScience.org is a global science gateway comprised of national and international scientific databases and portals. On behalf of the WorldWideScience Alliance, WorldWideScience.org was developed and is maintained by the Office of Scientific and Technical Information (OSTI), an element of the Office of Science within the U.S. Department of Energy.