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David M. Heer, Amyra Grossbard-Shechtman, The Impact of the Female Marriage Squeeze and the Contraceptive Revolution on Sex Roles and the Women's Liberation Movement in the United States, 1960 to 1975, Journal of Marriage and Family, Vol. 43, No. 1 (Feb., 1981), pp. 49-65
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David M. Heer (1981) studied this question.
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