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ASEC User Note: Migration Questions 1971 through 1980

The 1-year geographic mobility question was not asked from 1972 to 1975 and from 1977 to 1980. The first half of the decade (1971-1975) asked about migration since 1970 and the second half (1976-1980) since 1975. Therefore, only 1970-1971 and 1975-1976 ask a comparable 1-year question.  


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