Research prior to the pill.
D003270:Contraceptive Agents / Q000266:history*; D004412:Dysmenorrhea / Q000188:drug therapy; D004967:Estrogens / Q000494:pharmacology* / Q000627:therapeutic use; D005260:Female; D049673:History, 20th Century; D010060:Ovulation / Q000187:drug effects; D010902:Pituitary Gland / Q000187:drug effects
D003270:Contraceptive Agents; D004967:Estrogens