Retrieved after World War II from metal boxes and milk cans buried beneath the ruins of the Warsaw Ghetto, the Oyneg Shabes Ringelblum Archive was clandestinely compiled between 1940 and 1942 under the leadership of historian Emanuel Ringelblum. Members of the secret Oyneg Shabes organization gathered thousands of testimonies from natives of Warsaw and refugees from hundreds of other localities, creating a documentary record of the wartime fate of Polish Jewry. Now housed in the Jewish Historical Institute in Warsaw, the archive comprises some 35,000 pages, including documents, materials...