Columbia subject headings:
Regional economics--Congresses.
Regionalism--Africa--Congresses.
Regionalism--Canada--Congresses.
Harvard subject headings:
Regional economics--Congresses.
Regionalism--Africa--Congresses.
Regionalism--Canada--Congresses.
Princeton subject headings:
Regional economics--Congresses.
Regionalism--Africa--Congresses.
Regionalism--Canada--Congresses.