I just learned of this database of technical reports housed at Manoa, Univ. of Hawaii, via the Chemical Information Listserv — from the Univ. of Arkansas’ Engineering and Math Librarian.

"TRAIL-Technical Report Archive and Image Library: a collaborative project to digitize, archive, and provide persistent and unrestricted access to federal technical reports issued prior to 1975."

Actually, they have reports from much later than 1975.  Browsing is available, as well as detailed search functionality.

STATISTICS:

• Total reports in database: 1052
• Total fulltexts in database: 330
• Total images in database: 946

Organizations Involved:
The Greater Western Library Alliance (GWLA – www.gwla.org) and the Center for Research Libraries (CRL – www.crl.edu) are collaborating on a pilot project.

These are picked up by Google, not (necessarily?)  Google Scholar, and not by Scirus. Scopus and  U.S. Government databases will pick up (index) the reports, but probably won’t link to the full texts.