Columbia subject headings:
Harvard subject headings:
East Europeans--Canada--Congresses.
Europe, Central--Social conditions--Congresses.
Europe, Eastern--Social conditions--Congresses.
Germans--Canada--Congresses.
Hungarians--Canada--Congresses.
Princeton subject headings:
East Europeans--Canada--Congresses.
Europe, Central--Social conditions--Congresses.
Europe, Eastern--Social conditions--Congresses.
Germans--Canada--Congresses.
Hungarians--Canada--Congresses.