Columbia subject headings:
Harvard subject headings:
Albigenses.
Castles--France--Corbières Mountains.
Corbières Mountains (France)--Description and travel.
Princeton subject headings:
Albigenses--History.
Castles--France--Corbières Mountains Region--History.
Corbières Mountains Region (France)--Defenses--History.
Fortification--France--Corbières Mountains Region--History.