Documents from the post-war Auschwitz trial have been designated part of the UNESCO “Memory of the World Register,” underlining their significance as “common heritage of humanity,” Germany’s foreign minister said on Wednesday.

The 1963-1965 trial of 22 Nazi officials who ran the Auschwitz death camp marked a turning point when Germans faced up to their role in the Holocaust.

Unlike the better known 1945-1946 Nuremberg trials where judges from the Allied powers presided over the hearings of top Nazis, the Frankfurt trial was the first in which Germans prosecuted Germans.

In 183 days of hearings, the trial “paved the way for an entire society to take a critical look in the mirror at the role of Germans as citizens, participants, followers and criminals,” said Foreign Minister Heiko Maas.

The documents are “an important element in the fight against ongoing denial and relativizing of Nazi violations,” added Maas.

The material classed in the international register includes 454 volumes of files stored at the Hesse State Archives.

They contain 430 hours of recordings of the testimonies of 319 witnesses — including 181 survivors of the Auschwitz-Birkenau camp and 80 members of the camp staff, the SS, and the police — on 103 tapes, according to the UNESCO website.