Columbia subject headings:
Harvard subject headings:
Archives--Portugal--Congresses.
Archives--Spain--Congresses.
Numismatics--Portugal--Congresses.
Numismatics--Spain--Congresses.
Princeton subject headings:
Archives--Portugal--Congresses.
Archives--Spain--Congresses.
Numismatics--Portugal--Congresses.
Numismatics--Spain--Congresses.