Columbia subject headings:
Poland--History--Vladislaus IV Sigismund, 1632-1648.
Władysław IV Zygmunt, King of Poland, 1595-1648.
Harvard subject headings:
Poland--History--Vladislaus IV Sigismund, 1632-1648
Władysław IV Zygmunt, King of Poland, 1595-1648.
Princeton subject headings: