TY - BOOK ED - General Accounting Office, GAO TI - Nuclear weapons : NNSA needs to refine and more effectively manage its new approach for assessing and certifying nuclear weapons T2 - GAO report, GAO-06-261 PY - 2006/// CY - Washington, DC KW - USA KW - nuclear weapons KW - stockpile KW - safeguards KW - official publication UR - http://www.gao.gov/cgi-bin/getrpt?GAO-06-261 ER -