Columbia subject headings:
Investments, American--Turkey.
Ottoman-American Development Company.
Petroleum industry and trade--Turkey--History.
Railroads--Turkey--History.
Harvard subject headings:
Investments, American--Turkey.
Ottoman-American Development Company.
Petroleum industry and trade--Turkey--History.
Railroads--Turkey--History.
Princeton subject headings:
Railroads--Iraq--History.
Railroads--Turkey--History.
Turkey--Foreign relations.
Turkey--Politics and government--20th century.