Report W KL AUSCHWITZ 1940-1943 by Captain Witold Pilecki, Institute of National Remembrance, Pilecki Project Committee, transleted by Eva Hussain, Warsaw 2017, ISBN 978-83-8098-438

Witold Pilecki – Volunteer in Auschwitz, is a unique and symbolic man. During German occupation he was involved in underground activities against the German occupiers. As a volunteer, aware of the consequences and risks, he agreed under an assumed name - Tomasz Serafiński - to be caught in September 1940 in Warsaw and to be imprisoned by the Germans in the Auschwitz-Birkenau German concentration camp. Whilst in the camo, he coordinated the resistance movement, gathered and passed to the outside world the information about mass exterminations by the Germans against the Jewish population and their unprecedented cruelty, In April 1943, along with Jan Radziej and Edward Ciesielski he escaped from the camp. After escaping, he prepared the most important document "Report W", in which he described the situation in the German Concentration camp Auschwitz-Birkenau.