Sources
The Frank Shurman Collection
The Frank Shurman collection is fully and digitally accessible and contains correspondence between the Schürmann family from Hildesheim and their relative Otto Schürmann, including letters from Hildesheim in March 1942, from the Ahlem assembly camp and the Warsaw ghetto, in which the family describes the deportation.
Frank Shurman Collection, United States Holocaust Memorial Museum. Available at: https://collections.ushmm.org/search/catalog/irn500617?rsc=25323&cv=43&x=2549&y=1462&z=4.1e-4
