"The view of Franciszek Piper, the head of the historical research department at the Auschwitz-Birkenau State Museum, is that about one million Jews died in Auschwitz, corresponding to 90 per cent of the total number of victims; of the rest, at least 75,000 were ethnic Poles, almost 21,000 were Gypsies, about 15,000 were Soviet prisoners of war, and between 10,000 and 15,000 were people of other nationalities. The identity and the exact numbers of all the victims will probably never be known for sure; still today they are subject to some disagreement, even among leading professional historians."
Jonathan Webber