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.

Licence: Public Domain Mark

Credit: 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. Source: Wellcome Collection.