Columbia subject headings:
Foreign workers--Estonia--Language.
Immigrants--Estonia--Language.
Labor market--Estonia.
Minorities--Employment--Estonia.
Russians--Employment--Estonia.
Harvard subject headings:
Estonia--Ethnic relations.
Labor supply--Estonia.
Princeton subject headings:
Foreign workers--Estonia--Language.
Immigrants--Estonia--Language.
Labor market--Estonia.
Minorities--Employment--Estonia.
Russians--Employment--Estonia.