Columbia subject headings:
Barth, Karl, 1886-1968--Criticism and interpretation.
Heidegger, Martin, 1889-1976--Criticism and interpretation.
Metaphysics--History--20th century.
Philosophical theology--History--20th century.
Philosophy and religion--History--20th century.
Protestantism--History--20th century.
Harvard subject headings:
Barth, Karl, 1886-1968
Heidegger, Martin, 1889-1976
Metaphysics--History--20th century
Philosophical theology--History--20th century.
Protestantism--History--20th century.
Princeton subject headings: