Columbia subject headings:
Poland--Historiography.
Poland--History--Sources.
Poland--History--To 1572--Sources.
Harvard subject headings:
Princeton subject headings:
Kievan Rus--History--862-1237--Sources.
Kievan Rus--Relations--Poland--Sources.
Poland--History--Piast period, 960-1386--Sources.
Poland--Relations--Kievan Rus--Sources.