Columbia subject headings:
Harvard subject headings:
Germany--Foreign relations--Switzerland.
Switzerland--Foreign relations--Germany.
Switzerland--Foreign relations--United States.
Switzerland--Foreign relations.
Switzerland--History--20th century.
United States--Foreign relations--Switzerland.
World War, 1914-1918--Switzerland
Princeton subject headings:
Germany--Foreign relations--Switzerland.
Switzerland--Foreign relations--Germany.
Switzerland--Foreign relations--United States.
United States--Foreign relations--Switzerland.
World War, 1914-1918--Economic aspects--Switzerland.
World War, 1914-1918--Switzerland.