Search for: [Subject and Keywords = Poland 11th, 12th c.] OR [Subject and Keywords = Middle Ages] OR [Subject and Keywords = state] OR [Subject and Keywords = state administration] OR [Subject and Keywords = Polska 11, 12 w.] OR [Subject and Keywords = średniowiecze] OR [Subject and Keywords = państwo] OR [Subject and Keywords = administracja państwowa] OR [Title = The Administrative Structure of Poland in the Eleventh and Twelfth Century] OR [Title = The Administrative Structure of Poland in the Eleventh and Twelfth Century] OR [Creator = Bogucki, Ambroży] OR [Creator = Bogucki, Ambroży]