Columbia subject headings:
Public health--Europe--History--19th century.
Sewage disposal--Europe--History--19th century.
Sewage--Health aspects--Europe--History--19th century.
Harvard subject headings:
Public health--Europe--History--20th century.
Sewage disposal--Europe--History--19th century.
Sewage disposal--Europe--History--20th century.
Sewage--Health aspects--Europe--History--19th century.
Sewage--Health aspects--Europe--History--20th century.
Urban health--Europe--History--19th century.
Princeton subject headings: