[October Revolution and maternal welfare in Bulgaria].
D002031:Bulgaria; D006176:Gynecology / Q000266:history; D049673:History, 20th Century; D008427:Maternal Health Services / Q000266:history*; D009774:Obstetrics / Q000266:history; D014586:USSR
Oktombriĭskata revoliutsiia i okhranata na maĭchinstvoto v Bulgariia.