Columbia subject headings:
Christianity and other religions--Germany--Congresses.
Islam--Germany--Customs and practices--Congresses.
Islam--Relations--Christianity--Congresses.
Muslims--Germany--Social life and customs--Congresses.
Muslims--Religious life--Germany--Congresses.
Harvard subject headings:
Christianity and other religions--Germany--Congresses.
Islam--Germany--Customs and practices--Congresses.
Islam--Relations--Christianity--Congresses
Muslims--Germany--Social life and customs--Congresses.
Muslims--Religious life--Germany--Congresses.
Princeton subject headings: