Columbia subject headings:
United States--Foreign relations--1933-1945.
Harvard subject headings:
Ambassadors--United States--Correspondence.
Bullitt, William C. (William Christian), 1891-1967--Correspondence.
Presidents--United States--Correspondence
Roosevelt, Franklin D. (Franklin Delano), 1882-1945--Correspondence.
United States--Foreign relations--1933-1945.
Princeton subject headings:
United States--Foreign relations--1933-1945.