Ancestry.com. Lublin, Poland, Initial Registrations of Jews, 1939-1940 [database on-line]. Provo, UT, USA: Ancestry.com Operations, Inc., 2013.Original data: This data is provided in partnership with Jewish Gen.org
About Lublin, Poland, Initial Registrations of Jews, 1939-1940
After the Germans occupied the city of Lublin in September 1939 all Lublin men, Jews and non-Jews, between the ages of 14 and 60 had to report for registration. A second registration took place in January 1940. This database contains a registration book from what appears to be the first registration for surnames beginning with the letters M through Z.
You can learn more about this database at the Jewish Gen website.