U.S. nuclear warheads, 1945-2009
BY ROBERT S. NORRIS AND HANS M. KRISTENSEN
Of 100 types of U.S. warheads developed since 1945, only 15 remain active. New warhead production ceased in 1992, but modified warheads continue to be introduced.
http://thebulletin.metapress.com/content/213757w058n98374/?p=2f144bf6812d4757b51a0461916f45d1&pi=7
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