Ansell, Charles <br/><br/>
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 
 - London :  National Life Assurance Society,  1874 
 - 89 p. :  ill. ;  22 cm. 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Mortality
<br/><br/><label>Subjects--Geographic Terms: </label><br/>Vital statistics