Columbia subject headings:
Garum industry--Portugal--History.
Mineral industries--Portugal--History.
Roman provinces--Economic conditions.
Harvard subject headings:
Garum industry--Portugal--History.
Mineral industries--Portugal--History.
Roman provinces--Economic conditions.
Princeton subject headings:
Fishery processing--Portugal--History.
Mines and mineral resources--Portugal--History.
Portugal--Antiquities, Roman.
Romans--Portugal.