Columbia subject headings:
Harvard subject headings:
Baghdad Railway--History.
Germany--Foreign relations--Turkey.
Investments, German--Turkey--History.
Railroads--Iraq--History.
Turkey--Foreign relations--Germany.
Turkey--History--20th century.
Princeton subject headings:
Baghdad Railway--History.
Germany--Foreign relations--Turkey.
Investments, German--Turkey--History.
Railroads--Iraq--History.
Turkey--Foreign relations--Germany.
Turkey--History--20th century.