Columbia subject headings:
Poland--Church history--20th century.
Protestants--Poland--History--20th century.
Harvard subject headings:
Borgrefe, Friedhelm.
Poland--Church history--20th century
Poland--Description and travel
Protestant churches--Poland--History--20th century.
Princeton subject headings:
Borgrefe, Friedhelm.
Poland--Church history--20th century.
Poland--Description and travel.
Protestant churches--Poland--History--20th century.