Columbia subject headings:
Manchester (England)
Harvard subject headings:
Air--Pollution--England--Manchester--History--19th century.
Manchester (England)--Environmental conditions--19th century.
Smoke prevention--England--Manchester--History--19th century.
Smoke--England--Manchester--History--19th century.
Smoke--Environmental aspects--England--Manchester--History--19th century.
Princeton subject headings:
Air--Pollution--History--England--Manchester.
Smoke--History--England--Manchester.