It means just before the 1970's.
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A period of time before people of Spain invaded a country (e.g. Pre - Hispanic Mexico - before Spaniards arrived in Mexico.
Socialist. All the rubbish that the students came up with in the 60's became the law of the land in the 70's.
the democrats had majorities...
I don't know what CPT means, but PSI means Pre Sentencing Investigation
In the 1970s. HOW COOL