Columbia subject headings:
Caves--Spain--Religious aspects--History--To 1500.
Excavations (Archaeology)--Spain.
Spain--Antiquities.
Harvard subject headings:
Caves--Spain--Religious aspects--History--To 1500.
Excavations (Archaeology)--Spain
Spain--Antiquities
Princeton subject headings:
Caves--Spain--Religious aspects--History--To 1500.
Excavations (Archaeology)--Spain.
Spain--Antiquities.