Presents a study of Soviet interregional migration from 1986 to 1990. Follow-up to a comparative study of the interregional migration during the years 1971-1975 and 1981-1985; Net migration balances for the Soviet Union's 20 large economic planning regions; Siberia as a net gainer of migrants; Reversal of the population shift to the southern regions; Rural outflow from central-eastern European Russia.