Columbia subject headings:
Businessmen--United States--Biography.
Gumberg, Alexander, 1887-1939.
Soviet Union--Foreign economic relations--United States.
Soviet Union--Foreign relations--United States.
United States--Foreign economic relations--Soviet Union.
United States--Foreign relations--Soviet Union.
Harvard subject headings:
Businessmen--United States--Biography
Businesspeople--United States--Biography.
Gumberg, Alexander, 1887-1939.
Soviet Union--Foreign economic relations--United States.
Soviet Union--Foreign relations--United States.
United States--Foreign economic relations--Soviet Union.
United States--Foreign relations--Soviet Union.
Princeton subject headings:
Businesspeople--United States--Biography.
Gumberg, Alexander, 1887-1939.
Soviet Union--Foreign economic relations--United States.
Soviet Union--Foreign relations--United States.
United States--Foreign economic relations--Soviet Union.
United States--Foreign relations--Soviet Union.