Columbia subject headings:
Laurio (Greece)--Economic conditions--19th century.
Laurio (Greece)--History--19th century.
Natural resources--Greece--Laurio.
Harvard subject headings:
Laurio (Greece)--Economic conditions--19th century.
Laurio (Greece)--History--19th century.
Natural resources--Greece--Lavrion.
Princeton subject headings:
Laurio (Greece)--Economic conditions--19th century.
Mineral industries--Greece--Lavrion--History--19th century.