METCALFE, J PLACENTAL GAS TRANSFER. [electronic resource] - Anesthesiology - 460-4 p. digital Publication Type: Journal Article; Review ISSN: 0003-3022 Standard No.: 10.1097/00000542-196507000-00010 doi Subjects--Topical Terms: FemaleHumansMaternal-Fetal ExchangeOxygenPregnancy