Use the National Technical Reports Library (NTRL) to search by topic across more than 3 million National Technical Information Services (NTIS) documents, including technical reports published by many federal departments and agencies. More than 800,000 records have full-text PDFs.

Use science.gov to select multiple federal agencies. This site searches over 60 databases and over 2,200 scientific websites, representing 14 federal agencies, to provide users with access to more than 200 million pages of authoritative federal science information including research and development results.

The Environmental Protection Agency's repository for more than 7,000 full-text technical reports.

SciTech Connect is the Department of Energy's repository for full-text technical reports.

The US Geological Survey's site for technical reports and other publications.

Technical reports published by the National Institute of Standards and Technology (NIST)'s Building & Fire Research Laboratory.

The Department of Defense's site for technical reports and other publications.

TRAIL is a project for the digitization of historical US government technical reports. It contains records that link to digital copies in the HathiTrust Digital Library, records that link to digital copies in the University of North Texas Digital Library, and records of additional reports that TRAIL has harvested.

Agencies covered: Atomic Energy Commission, National Advisory Committee for Aeronautics, National Bureau of Standards, National Earthquake Information Center, Office of Saline Water, U.S. Bureau of Mines, Office of Technical Services, Fish and Wildlife Service.