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The Sudan fertility survey 1979 ; 1
(1982)
The Sudan fertility survey 1979 ; 2
Reproduction in the United States 1965
Ryder, Norman B., (1971)
Economic modules for use in fertility surveys in less developed countries
Freedman, Deborah S., (1974)
The changing family
Freedman, Deborah S., (1984)
Policy options at the end of the demographic transition : Taiwan, 1993
Freedman, Ronald, (1993)