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50 miles American Hospital Association AMERICAN MEDICAL ASSOCIATION average expectation Basic Trends birth and death Board of Health Cerebral hemorrhage Change in South cooperative county health units crude birth rate crude death rate Dakota Experiment Station decline decrease deﬁnite trend dentists depression period diseases due largely Experiment Station Bulletin Farm Security Administration federal ﬁeld ﬁnding ﬁrst ﬁve full time county full-time county health Health service contracts high average length hospital beds hospital service infant death infant mortality rate llll Lotka low death rate maternal mortality rate nn 1n number of deaths number of hospital number of persons percent persons per doctor PERSONS PER PHYSICIAN Pharmacists population prenatal Public Health Facilities public health nurses Public health service rate in South registration areas South Dakota Experiment standard Station Bulletin 334 supervision tality tion Trends of Social vital statistics W. F. Kumlien