Columbia subject headings:
Christian antiquities--Spain--Congresses.
Excavations (Archaeology)--Spain--Congresses.
Fortification--Spain--History--Congresses.
Islamic antiquities--Spain--Congresses.
Spain--Antiquities--Congresses.
Harvard subject headings:
Archaeology, Medieval--Congresses
Christian antiquities--Spain--Congresses.
Excavations (Archaeology)--Spain--Congresses
Fortification--Spain--History--Congresses.
Islamic antiquities--Spain--Congresses.
Spain--Antiquities--Congresses
Princeton subject headings:
Archaeology, Medieval--Congresses.
Archaeology--Spain--Congresses.
Archaeology--Spain--Madrid--Congresses.
Madrid (Spain)--Antiquities--Congresses.
Spain--Antiquities--Congresses.