Government Publishing Office index to official government publications in all formats. Many items in the catalog have links to full text online versions.
Try searching Google, typing your keyword(s) with site:gov in Google’s search box. You can narrow the search to a certain department or agency, for example: space system site:gao.gov will narrow your results to documents from the Government Accountability Office (GAO) and site:ntrs.nasa.gov will search the NASA technical reports server.
You can also limit your searches to other domains such as .mil and .edu ; refine results by date; or search for a specific type of file results. As an example, entering file:.pdf will only return PDF results: aircraft fatigue site:ntrs.nasa.gov filetype:pdf
