Columbia subject headings:
Infants--Mortality--United States.
United States--Economic conditions--1865-1918.
United States--Social conditions--1865-1918.
Harvard subject headings:
Infants--Mortality--United States
United States--Economic conditions--1865-1918.
United States--Social conditions--1865-1918.
Princeton subject headings:
Infants--Mortality--United States.
United States--Economic conditions--1865-1918.
United States--Social conditions--1865-1918.