Columbia subject headings:
England, Northern--Economic conditions.
England, Northern--Social conditions.
Poor--Health and hygiene--England, Northern.
Public health--England, Northern.
Social classes--England, Northern.
Harvard subject headings:
England, Northern--Economic conditions.
England, Northern--Social conditions.
Poor--Health and hygiene--England, Northern.
Public health--England, Northern.
Social classes--England, Northern.
Princeton subject headings:
Social medicine--England.