In the years after World War II, personal accounts and judicial evidence documented how the Nazis used poison gas to murder Jews and other persecuted groups. Yet revisionist historians have recently attempted to deny the Nazi's systematic gassing of millions. This remarkable book refutes these revisionists by confirming indisputably the grim historical truth about gassings. The volume was written by twenty-four authors from six countries (including Germany and Israel), most of them historians or jurists and many of them survivors of concentration camps. The authors set out the historical situation, provide new details about the dimensions of the gassings, and consider how it was possible for the Holocaust to have happened. Maps of extermination centres, plans of gas chambers and crematoria, and facsimile reproductions of secret Nazi documents are also included. Previously published in German and French, the book has now been translated and revised for English-speaking readers.