Columbia subject headings:
Theologians--Germany.
Theology, Doctrinal--Germany--History--20th century.
Wittig, Joseph, 1879-1949.
Harvard subject headings:
Catholic Church--Doctrines.
Modernism (Christian theology)--Catholic Church.
Mystics--Germany.
Theology, Doctrinal.
Wittig, Joseph, 1879-1949
Princeton subject headings: