Official German Record of Prisoners in Auschwitz Concentration Camp, May 1940 through December 1944 – by Dr. Germar Rudolf.
The railroad was responsible for the transportation of inmates to and from concentration camps and these figures from the Russian files are accurately reflected in the Reichsbahn documents.
Another avenue for confirmation exists in the wartime radio intercepts which are known to have been made. British wartime intelligence was eavesdropping on the radio traffic as Auschwitz (and other camps) sent regular reports to the relevant government department in Berlin. These messages were either in plain text or a low-level encrypt and consisted of lists of numbers corresponding to the various prisoner categories.
Total non-Jews in Auschwitz, 1940-1944: 161,785
Total Jews in Auschwitz, 1941-1944: 173,000
Total number of inmates in Auschwitz, 1940-1944: 334,785