One federated search engine that has begun to address this issue is WorldWideScience, hosted by the U.S. Department of Energy's Office of Scientific and Technical Information.
Science.gov OSTI hosts this USA.gov science portal in collaboration with 17 organizations within 13 Federal science agencies.
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WorldWideScience.org provides a global science gateway through a multilateral partnership to enable federated searching of national and international scientific databases and portals.
The information is provided as a free public service by the DOE Office of Scientific and Technical Information (OSTI), within the Office of Science.
Later officially named "WorldWideScience.org", the gateway was developed by the U.S. Department of Energy’s Office of Scientific and Technical Information.
Site of Special Scientific Interest | Scientific American | Microsoft Office | Home Office | War Office | The Office | scientific journal | Foreign and Commonwealth Office | United States Patent and Trademark Office | Commonwealth Scientific and Industrial Research Organisation | Information Technology | United States Information Agency | Office of the Inspector General | Office of Naval Research | Information technology | Office of Strategic Services | The Office (U.S. TV series) | National Center for Biotechnology Information | information technology | Cabinet Office | Oval Office | Technical University of Denmark | Post Office Protocol | Technical University of Lisbon | Technical University of Berlin | Program and System Information Protocol | Office of Naval Intelligence | Geographic information system | General Post Office | Colonial Office |