Try TRAIL (Technical Report Archive and Image Library)
http://digicoll.manoa.hawaii.edu/techreports/index.php
“collaborative project to digitize, archive, and provide persistent and unrestricted access to federal technical reports issued prior to 1975.
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”—-Source http://digicoll.manoa.hawaii.edu/techreports/index.php?c=1