Szwarcbard was one of the most hard-working members of Oneg Shabbat. His manuscripts appear in about 170 documents in the Archive. He left his own writings and a selection of copies of other documents, including notes by Emanuel Ringelblum.
On February 1942 Bluma Wasser wrote down Szlama Ber Winer's detailed testimony of mass extermination of people in gas vans in Chelmno
The Germans had planned the beginning of the second stage of liquidation of the ghetto for 18 January 1943. The goal was to deport about 8,000 people to Treblinka.
A teacher and a social activist. The Ringelblum Archive contains more than a dozen sketches he wrote about the Jewish community in Grodzisk Mazowiecki and selected locations in the Sochaczew county: Podkowa Leśna, Wiskitki and Sochaczew