Columbia subject headings:
Catholic Church--Relations.
Catholic Church. Secretariatus pro Non Credentibus.
Christianity and atheism.
Christianity and other religions.
König, Franz, 1905-2004.
Harvard subject headings:
Catholic Church--Relations.
Catholic Church. Secretariatus pro Non Credentibus.
Christianity and atheism.
Faith and reason--Christianity
König, Franz, 1905-2004
Princeton subject headings: