Columbia subject headings:
Harvard subject headings:
England--Antiquities, Roman
Essex (England)--Antiquities, Roman.
Pottery, Belgic--England--Essex.
Pottery, Roman--England--Essex.
Salt industry and trade--England--Essex--History.
Princeton subject headings:
Essex (England)--Antiquities.
Excavations (Archaeology)--England--Essex.
Salt industry and trade--England--Essex--History.