1977 Event U.S.S.R. performs nuclear test at Sary Shagan U.S.S.R. 1977 Event U.S.S.R. performs nuclear test at Sary Shagan U.S.S.R. 1976 Event U.S.S.R. performs nuclear test at Sary Shagan U.S.S.R. 1974 Event U.S.S.R. performs nuclear test at Sary Shagan U.S.S.R. 1970 Event U.S.S.R. performs nuclear test at Sary Shagan U.S.S.R. 1968 Event U.S.S.R. performs nuclear test at Sary Shagan U.S.S.R. 1968 Event U.S.S.R. performs nuclear test at Sary Shagan U.S.S.R. 1967 Event U.S.S.R. performs nuclear test at Sary Shagan U.S.S.R. 1967 Event U.S.S.R. performs nuclear test at Sary Shagan U.S.S.R. 1961 Event U.S.S.R. performs nuclear test at Sary Shagan U.S.S.R.
