However the Statistisches Bundesamt issued a report in 1958 which put expulsion deaths at some 2.2 million in agreement with Schieder's total  A 1974 an internal study by the German Federal Archives found some 600,000 deaths, including 400,000 in the Oder-Neisse territory, 130,000 in Czechoslovakia and 80,000 in Yugoslavia. The study excluded losses in Hungary, Rumania and Soviet Germans deported within the Soviet Union. This study was not released to the public until in 1989. The estimates of 2.0 million deaths due to expulsions have been criticized by subsequent researchers. For example, according to the German historian Rüdiger Overmans it is only possible to establish the deaths of 500,000 individuals and there is nothing in German historiography which could explain the other 1.5 million deaths. Overmans and Ingo Haar state that confirmed deaths result in a number between 500,000 and 600,000. Both believe that further research is needed to determine the fate of the estimated additional 1.9 million civilians listed as missing. However, according to Overmans the 500,000 to 600,000 deaths found by the Search Service and German Federal Archives are based on incomplete information and do not provide a definitive answer to losses in the expulsions. However Overmans maintains that there are more arguments in favor of the lower figure of 500,000 than the official figure of 2.0 million, he believes that additional research is needed to determine an accurate accounting of the losses. Ingo Haar has said that all reasonable estimates of deaths from expulsions lie between around 500,000 to 600,000. According to Rüdiger Overmans, the German Red Cross Search Service records list 473,013 confirmed deaths and some 1.9 million persons listed as missing. Overmans maintains that the figure of missing persons includes non Germans included in the total population surveyed, military deaths, the figures for living expellees in the GDR and remaining ethnic Germans in post war east central Europe were not reliable. Ingo Harr maintains that the figures for expulsion dead include children who were never born (due to lower wartime fertility), German speaking Jews murdered in the Holocaust and individuals who were assimilated into the local population after the war. He also stated that the Statistisches Bundesamt's 2.225 million number relied on improper statistical methodology and incomplete data, particularly in regard to the expellees who arrived in East Germany after the war.