Links below are for technical report citations and some online PDFs.
From the Department of Energy (DOE). For best results, sign up for a free account and use the Advanced Search. 1943 - present.
Also, try the DOE OpenNet System.
Contains PDFs of many reports. For better search capabilities, try NTIS.
Abstracts and full-text reports of NASA and NACA, 1915-present
Includes U.S. Atomic Energy Commissions (AEC), U.S. Bureau of Mines, U.S. Dept of Commerce, National Bureau of Standards. Most reports prior to 1975.
Selected reports from DTNSRDC series C, R, & Trans.
Some are available in Barton. Try a "Title Begins with" search for the series number. Example: NUREG/BR
Searchable database of public/unclassified reports published since 1974. Some full text.
Atomic and physical properties of the elements; atomic and molecular spectroscopy; nuclear physics data; condensed matter physics data; and more. A searchable element index combines the data from various sources.