Columbia subject headings:
Cumming, Mansfield, Sir, 1859-1923.
Espionage--Great Britain--History.
Great Britain. MI6--History.
Intelligence officers--Great Britain--Biography.
Intelligence service--Great Britain--History.
Harvard subject headings:
Cumming, Mansfield, Sir, 1859-1923.
Cumming, Mansfield.
Espionage--Great Britain--History.
Great Britain. MI6--History.
Intelligence officers--Great Britain--Biography.
Intelligence service--Great Britain--History.
Princeton subject headings:
Cumming, Mansfield, Sir, 1859-1923.
Espionage--Great Britain--History.
Great Britain. MI6--History.
Intelligence officers--Great Britain--Biography.
Intelligence service--Great Britain--History.