Columbia subject headings:
Harvard subject headings:
Mecca (Saudi Arabia)--Civilization--Congresses.
Mecca (Saudi Arabia)--History--Congresses.
Mecca (Saudi Arabia)--In Islam--Congresses.
Mecca (Saudi Arabia)--Intellectual life--Congresses.
Mecca (Saudi Arabia)--Social life and customs--Congresses.
Princeton subject headings:
Mecca (Saudi Arabia) in Islam--Congresses.
Mecca (Saudi Arabia)--Civilization--Congresses.
Mecca (Saudi Arabia)--History--Congresses.
Mecca (Saudi Arabia)--Intellectual life--Congresses.
Mecca (Saudi Arabia)--Social life and customs--Congresses.