Columbia subject headings:
Poland--History--Sigismund III, 1587-1632.
Russia--History--Time of Troubles, 1598-1613.
Harvard subject headings:
Poland--History--Sigismund III, 1587-1632
Russia--History--Time of Troubles, 1598-1613.
Princeton subject headings:
Poland--History--Sigismund III, 1587-1632.
Russia--History--Time of Troubles, 1598-1613.