During the 60s and 70s of the 20th century
The 1960s and 1970s
in the 60s and 70s of the 20th century
About 20th century 60's to 70's
the 1960s(60's); the 1970s(70's)
in the nineteen sixties and seventies,1960s-1970s,1960's-1970'
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