Columbia subject headings:
Poland. Sejm, 1652 (1st January-March)
Poland. Sejm, 1652 (2nd, July-August)
Harvard subject headings:
Poland--Politics and government--1572-1763
Poland. Sejm, 1652 (1st January-March)
Poland. Sejm, 1652 (2d, July-August)
Poland. Sejm.
Princeton subject headings:
Poland. Sejm, 1652 (1st January-March)
Poland. Sejm, 1652 (2d, July-August)