Columbia subject headings:
Railroads--Turkey--History--20th century.
Soviet Union--Foreign economic relations--Turkey.
Turkey--Economic policy.
Turkey--Foreign economic relations--Soviet Union.
Harvard subject headings:
Railroads--Turkey--History--20th century.
Soviet Union--Foreign economic relations--Turkey.
Turkey--Economic policy.
Turkey--Foreign economic relations--Soviet Union.
Princeton subject headings:
Railroads--Turkey--History--20th century.
Russia--Foreign economic relations--Turkey.
Turkey--Economic policy.
Turkey--Foreign economic relations--Russia.