Columbia subject headings:
Barth, Karl, 1886-1968--Censorship--Sources.
Censorship--Switzerland--Sources.
Germany--Foreign relations--Switzerland--Sources.
Switzerland--Foreign relations--Germany--Sources.
Switzerland--History--20th century--Sources.
Harvard subject headings:
Barth, Karl, 1886-1968
Censorship--Switzerland.
Switzerland--Foreign relations--Germany.
Switzerland--History--20th century.
Princeton subject headings:
Barth, Karl, 1886-1968--Censorship--Sources.
Censorship--Switzerland--Sources.
Germany--Foreign relations--Switzerland--Sources.
Switzerland--Foreign relations--Germany--Sources.
Switzerland--History--20th century--Sources.