The cornerstone of this is the Nuclear Non-Proliferation Treaty, which considers only five countries as nuclear-weapons powers.
VOA: standard.2009.09.29
The magical world of Disney animation lost its cornerstone in 1966 when the 65-year-old Disney died of lung cancer.
VOA: standard.2010.02.26
"It has been a cornerstone of the security of both nations, as well as the economic prosperity of both nations for almost 50 years now,".
VOA: standard.2009.09.23
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