Timothy Snyder reminds us that the symbolization of the Holocaust by Auschwitz has a certain Western European bias to it:
The very reasons that we know something about Auschwitz warp our understanding of the Holocaust: we know about Auschwitz because there were survivors, and there were survivors because Auschwitz was a labor camp as well as a death factory. These survivors were largely West European Jews, because Auschwitz is where West European Jews were usually sent. After World War II, West European Jewish survivors were free to write and publish as they liked, whereas East European Jewish survivors, if caught behind the iron curtain, could not. In the West, memoirs of the Holocaust could (although very slowly) enter into historical writing and public consciousness.Read the whole thing, which goes on to discuss Nazi war crimes eclipsed by the Holocaust as well as Stalin's mass murders.
This form of survivors' history, of which the works of Primo Levi are the most famous example, only inadequately captures the reality of the mass killing. The Diary of Anne Frank concerns assimilated European Jewish communities, the Dutch and German, whose tragedy, though horrible, was a very small part of the Holocaust. By 1943 and 1944, when most of the killing of West European Jews took place, the Holocaust was in considerable measure complete. Two thirds of the Jews who would be killed during the war were already dead by the end of 1942. The main victims, the Polish and Soviet Jews, had been killed by bullets fired over death pits or by carbon monoxide from internal combustion engines pumped into gas chambers at Treblinka, Belzec, and Sobibor in occupied Poland.
Auschwitz as symbol of the Holocaust excludes those who were at the center of the historical event. The largest group of Holocaust victims--religiously Orthodox and Yiddish-speaking Jews of Poland, or, in the slightly contemptuous German term, Ostjuden--were culturally alien from West Europeans, including West European Jews. To some degree, they continue to be marginalized from the memory of the Holocaust. The death facility Auschwitz-Birkenau was constructed on territories that are today in Poland, although at the time they were part of the German Reich. Auschwitz is thus associated with today's Poland by anyone who visits, yet relatively few Polish Jews and almost no Soviet Jews died there. The two largest groups of victims are nearly missing from the memorial symbol.
An adequate vision of the Holocaust would place Operation Reinhardt, the murder of the Polish Jews in 1942, at the center of its history. Polish Jews were the largest Jewish community in the world, Warsaw the most important Jewish city. This community was exterminated at Treblinka, Belzec, and Sobibor. Some 1.5 million Jews were killed at those three facilities, about 780,863 at Treblinka alone. Only a few dozen people survived these three death facilities. Belzec, though the third most important killing site of the Holocaust, after Auschwitz and Treblinka, is hardly known. Some 434,508 Jews perished at that death factory, and only two or three survived. About a million more Polish Jews were killed in other ways, some at Chelmno, Majdanek, or Auschwitz, many more shot in actions in the eastern half of the country.
All in all, as many if not more Jews were killed by bullets as by gas, but they were killed by bullets in easterly locations that are blurred in painful remembrance. The second most important part of the Holocaust is the mass murder by bullets in eastern Poland and the Soviet Union. It began with SS Einsatzgruppen shootings of Jewish men in June 1941, expanded to the murder of Jewish women and children in July, and extended to the extermination of entire Jewish communities that August and September. By the end of 1941, the Germans (along with local auxiliaries and Romanian troops) had killed a million Jews in the Soviet Union and the Baltics. That is the equivalent of the total number of Jews killed at Auschwitz during the entire war. By the end of 1942, the Germans (again, with a great deal of local assistance) had shot another 700,000 Jews, and the Soviet Jewish populations under their control had ceased to exist.