Columbia subject headings:
Polish people--Former Polish Eastern Territories--Ethnic identity.
Polish people--Former Polish Eastern Territories--Intellectual life.
Harvard subject headings:
Former Polish Eastern Territories--Intellectual life--Sources--Congresses.
Polish people--Former Polish Eastern Territories--Intellectual life--Sources--Congresses.
Princeton subject headings:
Polish people--Former Polish Eastern Territories--Ethnic identity.
Polish people--Former Polish Eastern Territories--Intellectual life.