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Vital statistics: a discussion of what they are and their uses in public health administration, by John W. Trask, assistant surgeon general, United States Public health service. 19
Vital statistics: a discussion of what they are and their uses in public health administration, by John W. Trask, assistant surgeon general, United States Public health service. 19
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Vital statistics: a discussion of what they are and their uses in public health administration, by John W. Trask, assistant surgeon general, United States Public health service. 19