Pediatric respiratory therapy of the 1930s.
D002641:Chicago; D002648:Child; D002654:Child Care / Q000379:methods; D002675:Child, Preschool; D004865:Equipment and Supplies, Hospital / Q000266:history*; D049673:History, 20th Century; D006801:Humans; D007223:Infant; D010102:Oxygen Inhalation Therapy / Q000266:history / Q000295:instrumentation; D010372:Pediatrics / Q000266:history; D012138:Respiratory Therapy / Q000266:history* / Q000295:instrumentation; D012140:Respiratory Tract Diseases / Q000628:therapy; D014922:Wisconsin