Columbia subject headings:
Christian literature, Polish--History and criticism.
Language and languages--Religious aspects--Catholic Church.
Polish language--History.
Polish language--Religious aspects.
Harvard subject headings:
Poland--Church history--Congresses.
Polish language--History--Congresses.
Polish language--Religious aspects--Christianity--Congresses.
Princeton subject headings:
Poland--Church history--Congresses.
Polish language--History--Congresses.
Polish language--Religious aspects--Christianity--Congresses.