Columbia subject headings:
Poland--History--John II Casimir, 1648-1668.
Poland--History--Sigismund III, 1587-1632.
Poland--History--Vladislaus IV Sigismund, 1632-1648.
Vasa, House of--Poland--History.
Harvard subject headings:
Poland--History--Elective monarchy, 1572-1763
Poland--Kings and rulers--Biography.
Vasa, House of.
Princeton subject headings:
Poland--History--Elective monarchy, 1572-1763.
Vasa, House of.