TI - HEalth instruction yearbook 1948 PT - JOUR DP - 1949 TA - Journal of the American Medical Association pages = {577}, VI - 140 IP - 6 AID - 10.1001/jama.1949.02900410073038 [doi] 4100 - http://dx.doi.org/10.1001/jama.1949.02900410073038 SO - Journal of the American Medical Association June 11, 1949 140(6):577