OSTI, the Office of Sci­ence and Tech­nol­ogy Infor­ma­tion is worth book­mark­ing.  It serves as a por­tal for most of the fed­eral goverment’s infor­ma­tion, reports and data for 18 agen­cies:

Agriculture,Commerce, Defense, Edu­ca­tion, Energy, Health & Human Ser­vices, Inte­rior, Trans­porta­tion, Envi­ron­men­tal Pro­tec­tion Agency, Library of Con­gress, National Aero­nau­tics & Space Admin­is­tra­tion, National Archives & Records Admin­stra­tion, National Sci­ence Foun­da­tion, and the US Gov­ern­ment Pub­li­ca­tions Office.

Ter­mi­nol­ogy and the­sauri might help in your infor­ma­tion searches.

This site is a gate­way to DOE col­lec­tions at ScienceAccelerator.gov, global sci­ence via WorldWideScience.org, sci­en­tific research data as an open gov­ern­ment ini­tia­tive, and the OSTIblog.

Much of this, they declare, is out­side Google’s purview — in the “deep web.”