Abbreviated NTBT, this 1963 treaty was signed by the U.S., the USSR & the U.K.
Under 
Water, but is often abbreviated as the Partial Test Ban Treaty (PTBT),... [DOC] [TLE] Partial Test Ban Treaty - Dictionnaires [PAR] Dfinitions de Partial Test Ban Treaty, synonymes, antonymes, drivs de ... 
Limited Test Ban Treaty (LTBT), or Nuclear Test Ban Treaty (NTBT) (although the 
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