Columbia subject headings:
Harvard subject headings:
Bohemia (Czech Republic)--Politics and government--To 1526
Bohemia (Czech Republic)--Relations--Poland.
Piast dynasty.
Poland--Civilization--Czech influences.
Poland--History--Piast period, 960-1386
Poland--Relations--Czech Republic--Bohemia.
Princeton subject headings:
Bohemia (Czech Republic)--Politcs and governmentyTo 1526.
Czechoslovakia--Relations--Poland.
Piast dynasty.
Poland--Civilization--Czech influences.
Poland--History--Piast period, 960-1386.
Poland--Relations--Czechoslovakia.