Columbia subject headings:
Polish language--Errors of usage.
Polish language--History--20th century.
Polish language--Provincialisms.
Polish language--Spoken Polish--Foreign countries.
Polish language--Spoken Polish.
Harvard subject headings:
Polish language--Errors of usage.
Polish language--Foreign countries--Spoken Polish.
Polish language--History--20th century.
Polish language--Provincialisms.
Polish language--Spoken Polish--Foreign countries.
Polish language--Spoken Polish.
Princeton subject headings:
Polish language--Dialects.
Polish language--Provincionalism.
Polish language--Spoken Polish.