SELF-ADMINISTERED NITROUS-OXIDE/OXYGEN ANALGESIA IN OBSTETRICS. WITH PARTICULAR REFERENCE TO THE 'LUCY BALDWIN' MACHINE.
D000698:Analgesia; D000758:Anesthesia; D000773:Anesthesia, Obstetrical; D000776:Anesthesiology; D004864:Equipment and Supplies; D009609:Nitrous Oxide; D009774:Obstetrics; D010100:Oxygen
D009609:Nitrous Oxide; D010100:Oxygen
ANESTHESIA, OBSTETRICAL; EQUIPMENT AND SUPPLIES; NITROUS OXIDE