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National Technical Information Service
The National Technical Information Service serves as the largest central resource for government-funded scientific, technical, engineering, and business related information available today.
Digital trails of technical literature formed in the wake of aerospace research.
Hewlett-Packard Laboratories Technical Reports
Available here are the abstracts and full texts of HP Labs Technical Reports. Where only the abstract appears, the full text is unavailable due to copyright considerations.
OpenGrey is a multidisciplinary European database, covering science, technology, biomedical science, economics, social science and humanities.
U.S. Department of Energy Office of Scientific and Technical Information