Columbia subject headings:
Panama Canal Treaties
Panama--Foreign relations--United States.
United States--Foreign relations administration.
United States--Foreign relations--Panama.
Harvard subject headings:
Panama Canal Treaties
Panama--Foreign relations--United States.
United States--Foreign relations administration.
United States--Foreign relations--Panama.
Princeton subject headings:
Panama Canal Treaties
Panama--Foreign relations--United States.
United States--Foreign relations administration.
United States--Foreign relations--Panama.