Columbia subject headings:
Harvard subject headings:
Cobb, Zach Lamar, 1880-1951.
Intelligence officers--United States--Biography.
Mexico--Foreign relations--United States.
Mexico--History--Revolution, 1910-1920.
United States--Foreign relations--Mexico.
Princeton subject headings:
Cobb, Zach Lamar, 1880-1951.
Mexico--Foreign relations--United States.
Mexico--History--Revolution, 1910-1920--Diplomatic history.
United States--Foreign relations--Mexico.