Title: En el corazón del infierno
Subjects: Concentration camps, Auschwitz (Concentration camp), Birkenau (Concentration camp), World War, 1939-1945, Holocaust, Jewish (1939-1945), Polish Personal narratives, Concentration camp inmates, Biography, Sonderkommandos, Personal narratives
Places: Poland
People: Zalmen Gradowski (1910-1944)