Daily Graphic (1913, "The Troubles in Mexico").
Daily Mail (1920).
Engineering and Mining Journal.
Financial News (1912-21).
Financial Times (1921).
Financier.
Lord Fisher's Letters to the Times (September 1919).
Manchester Guardian (1921).
Petroleum Review (1910-21).
Petroleum Times (1920).
UNITED STATES
Barnes, The Romance of Persian Oil. The Standard Oil Companies (1920).
Brooklyn Eagle (1920-21).
Nation (1921).
Petroleum Magazine (1921).
Public Ledger (Philadelphia).
Reports of the State Department for Foreign Affairs.
Hepburn Committee.
Inter-State Commerce Commission.
Director of the Bureau of Mines to the Secretary of State for the Interior.
Statistics of the Geological Survey.
Smithsonian Institute.
Independent Oil Producers' Agency.
American Chamber of Commerce in Paris.
National Bank of Commerce of New York.
Washington Post (1919-20).
World's Work (1920).