Ancestry.com. Poland, Last Letters from the Łódź (Lodsch) Ghetto, 1941 [database on-line]. Provo, UT, USA: Ancestry.com Operations, Inc., 2013.Original data: This data is provided in partnership with Jewish Gen.org
This database is an index of 4,022 people named in letters written by residents of the Lódz Ghetto in May 1942 . The letters were requests for exemption from "resettlement."
You can learn more about this database at the Jewish Gen website.