No abstract available
MeSH terms
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Animals
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Contraceptives, Oral / history*
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Contraceptives, Oral, Synthetic / history*
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Contraceptives, Postcoital
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Dose-Response Relationship, Drug
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Female
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History, 20th Century
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Humans
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Norethindrone / history
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Norethynodrel / history
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Ovulation / drug effects*
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Pregnancy
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Progesterone / pharmacology*
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Puerto Rico
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Rabbits
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United States
Substances
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Contraceptives, Oral
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Contraceptives, Oral, Synthetic
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Contraceptives, Postcoital
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Progesterone
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Norethynodrel
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Norethindrone