Columbia subject headings:
Harvard subject headings:
Decentralization in government--Portugal--Congresses.
Regional planning--Portugal--Congresses.
Regionalism--Europe--Congresses
Regionalism--Portugal--Congresses.
Princeton subject headings:
Decentralization in government--Portugal--Congresses.
Regional planning--Portugal--Congresses.
Regionalism--Europe--Congresses.
Regionalism--Portugal--Congresses.