Seal of the <a href="https://en.wikipedia.org/wiki/United_States_Department_of_Energy" class="extiw" title="en:United States Department of Energy">United States Department of Energy</a>.
U.S. Government
Extracted from PDF version of the <a rel="nofollow" class="external text" href="http://www.ncs.gov/library.html#ncs">2007 NCS Annual Report</a> (direct PDF URL <a rel="nofollow" class="external autonumber" href="http://www.ncs.gov/library/reports/ncs_fy2007.pdf">[1]</a>).<br>