TI - THe relief of pain in childbirth PT - JOUR DP - 1939 TA - Journal of the American Medical Association pages = {2604-2605}, VI - 112 IP - 25 AID - 10.1001/jama.1939.02800250028016 [doi] 4100 - http://dx.doi.org/10.1001/jama.1939.02800250028016 SO - Journal of the American Medical Association June 24, 1939 112(25):2604