TI - The practitioners library of medicine and surgery. volume xii: Preventive medicine and hygiene PT - JOUR DP - 1938 TA - Journal of the American Medical Association pages = {1313}, VI - 110 IP - 16 AID - 10.1001/jama.1938.02790160071034 [doi] 4100 - http://dx.doi.org/10.1001/jama.1938.02790160071034 SO - Journal of the American Medical Association April 16, 1938 110(16):1313