Dictionary of the Holocaust : Biography, geography, and terminology / E.J. Epstein, P. Rosen. – Westport, 1997. – p. 218
A group of Jewish social historians compiled notes, data, and documentation of Warsaw Ghetto life and the process of annihilation. The group was led by Emmanuel Ringelblum and collected 100 volumes of material, after who the archive is named. After the war, two milk cans and ten cases or records, documents, journals, and notes were unearthed. Historical documentation of ghetto conditions was forbidden by the Nazis and punishable by death.
Ringelblum Archives