Online government document databases. Access to documents may be restricted.
A comprehensive list of US government documents available online.
The NTRS is a valuable resource for researchers, students, educators, and the public to access NASA's current and historical technical literature and engineering results.
Search U.S. government technical reports issued primarily prior to 1975 and digitized by the TRAIL Working Groups.
The Defense Technical Information Center. Provides selected full-text and bibliographic records of unclassified, unlimited technical reports. This site includes reports that have been received and processed since 1985.