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Google Scholar provides a simple way to broadly search for scholarly literature across many disciplines and sources.
(Note: To maximize access to Lehigh resources, when in Google Scholar, go to Settings, then Library links, then type in Lehigh University. If we do not subscribe to an article, this setting will enable a Lehigh Link to obtain the article via interlibrary loan.)
Links to PDFs when available; excellent for finding specific articles or books.
Portal to all US agencies. Technical reports are a small portion of the available documents but this site often has the hard-to-find smaller agencies and State reports.
Many of the services listed here overlap coverage. Often reports previous to the mid-1980's are only indexed. Most of the engines provide sophisticated search options (technical report number, contract number, issuing agency, and the like). Unless otherwise indicated, these provide free access to reports.