Research prior to the pill.
D000653:Amniotic Fluid; D000818:Animals; D002417:Cattle; D003270:Contraceptive Agents / Q000266:history*; D003864:Depression, Chemical; D004967:Estrogens; D005260:Female; D049673:History, 20th Century; D010060:Ovulation / Q000187:drug effects; D012106:Research
D003270:Contraceptive Agents; D004967:Estrogens