21.   Historians argue to this day over which ethnic group populated the regions first.

22.   Some German historians have argued that Goldhagen presents no new research and manipulates accepted fact for his own conclusions.

23.   Some historians argue that Polish or Soviet Communist secret police masterminded it in order to justify the Soviet presence in Poland.

24.   But historians argue that while some Galichina men did fight Soviet troops, others indulged in massacres of Jewish, Polish and Russian civilians.

25.   The bombing was unnecessary, these so-called revisionist historians argue.