The book Die Nemesis von Potsdam has  pages of bibliography  archives demographic studies official publications of the US Great Britain France Switzerland Poland etc besides secondary literature  These sources are tken into account in some  footnotes in the book and brought up to date in the th revised and enlarged edition which you can borrow from any library  As far as German statistics on the deaths that resulted from the evacuationflightexpulsion of the Germans the figure of  million deaths is considered to be on the low side of the spectrum As you may know the German Red Cross Statistisches Bundesamt Heimatortskarteien Gesamterhebung and other professional not amateur institutions carried out careful demographic studies especially in connection with the search for missing persons  This work was carried out over many years and the results were always the same  between  and  million missing and dead  The fact that Poland was a victim of aggression and war crimes by both Germany and the Soviet Union does not justify or legalize the crimes committed against East Prussian farmers Silesian coal miners factory workers and their families  JvA