On the rate of mortality at early periods of life, the age at marriage, the number of children to a marriage, the length of a generation and other statistics of families in the upper and professional classes / by Charles Ansell, Jun.

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On the rate of mortality at early periods of life, the age at marriage, the number of children to a marriage, the length of a generation and other statistics of families in the upper and professional classes / by Charles Ansell, Jun. Public Domain Mark. Source: Wellcome Collection.