Columbia subject headings:
Bonhoeffer, Dietrich, 1906-1945.
Iwand, Hans Joachim, 1899-1960.
Theology, Doctrinal.
Harvard subject headings:
Bonhoeffer, Dietrich, 1906-1945--Congresses.
Church history--20th century--Congresses.
Iwand, Hans Joachim, 1899-1960--Congresses.
Theology, Doctrinal--History--20th century--Congresses.
Princeton subject headings: