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- W2291110437 abstract "The results of a fertility survey undertaken in the Haidian district of Beijing, China, in 1981 are presented. The data are from a random sample of 6.3 percent of the population at selected ages. The results show an increase in age at marriage, a decrease in the interval between marriage and first birth, and a decrease in the number of pregnancies associated with the family planning program." @default.
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- W2291110437 date "1983-01-29" @default.
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- W2291110437 title "[Some problems found in a retrospective survey of fertility in Haidian district, Beijing]." @default.
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