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Birth control --- Family life surveys --- Family size --- Fertility, Human --- Health surveys --- Statistical methods. --- Statistical methods. --- Statistical methods. --- National Survey of Family Growth (U.S.).
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Family size --- Fertility, Human --- Birth control --- Health surveys --- Family life surveys --- Statistical methods. --- Statistical methods. --- Statistical methods. --- National Survey of Family Growth (U.S.) --- National Survey of Family Growth (U.S.) --- United States.
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