Columbia subject headings:
Water--Pollution--England--London--History--19th century.
Water--Pollution--England--Thames River Watershed--History--19th century.
Harvard subject headings:
Water--Pollution--England--London--History--19th century.
Water--Pollution--England--Thames River Watershed--History--19th century.
Princeton subject headings:
Water--Pollution--England--London--History--19th century.
Water--Pollution--England--Thames, River--History--19th century.