University of Maryland -
A concise list of government agencies with free access to their technical reports:
DTIC helps the Department of Defense (DoD) community access pertinent scientific and technical information to meet mission needs more effectively.
Information Bridge (U.S. Department of Energy)
Provides free public access to over 230,000 full-text documents and bibliographic citations of Department of Energy (DOE) research report literature. Documents are primarily from 1991-present and were produced by DOE, the DOE contractor community, and/or DOE grantees.
A collaborative project to digitize, archive, and provide persistent and unrestricted access to federal technical reports issued prior to 1975.
The results of CRREL's research projects are published in a technical report series covering topics of interest to Civil and Environmental Engineers. Reports from 1995 to present are available, as well as some older ones.
1920–present. Indexes technical reports, conference papers, journal articles, and other publications sponsored by the National Aeronautics and Space Administration (NASA) and its predecessor, the National Advisory Committee for Aeronautics (NACA). NACA Reports, Technical Notes, and Technical Memoranda are available in fulltext from 1917–1958. Some NASA reports are fulltext.
Fulltext of more than 7,000 archival and current EPA documents.