Columbia subject headings:
Excavations (Archaeology)--England--Sheffield.
Sheffield (England)--History.
Steel industry and trade--England--Sheffield--History.
Harvard subject headings:
Excavations (Archaeology)--England--Sheffield.
Sheffield (England)--History.
Steel industry and trade--England--Sheffield--History.
Princeton subject headings:
Excavations (Archaeology)--England--Sheffield.
Sheffield (England)--History.
Steel industry and trade--England--Sheffield--History.