Columbia subject headings:
Baltic States--Social conditions--Congresses.
Cities and towns--Baltic States--Congresses.
Migration, Internal--Baltic States--Congresses.
Urbanization--Baltic States--Congresses.
Harvard subject headings:
Baltic States--Social conditions--Congresses.
Cities and towns--Baltic States--Congresses.
Migration, Internal--Baltic States--Congresses.
Urbanization--Baltic States--Congresses.
Princeton subject headings: