Columbia subject headings:
Christian antiquities--Spain--Congresses.
Excavations (Archaeology)--Spain--Congresses.
Spain--Antiquities--Congresses.
Spain--Church history--Congresses.
Harvard subject headings:
Christian antiquities--Spain--Congresses.
Excavations (Archaeology)--Spain--Congresses
Spain--Antiquities--Congresses.
Spain--Church history--Congresses.
Princeton subject headings:
Christian antiquities--Portugal--Congresses.
Christian antiquities--Spain--Congresses.
Excavations (Archaeology)--Portugal--Congresses.
Excavations (Archaeology)--Spain--Congresses.
Portugal--Antuities--Congresses.
Portugal--Church history--Congresses.
Spain--Antiquities--Congresses.
Spain--Church history--Congresses.