Columbia subject headings:
Railroads--Turkey--History--19th century.
Railroads--Turkey--İzmir--History--19th century.
Harvard subject headings:
Railroads--Turkey--History--19th century.
Railroads--Turkey--İzmir--History--19th century.
Princeton subject headings:
Railroads--Turkey--History--19th century.
Railroads--Turkey--İzmir--History--19th century.