Widower Jakob Träger his daughter and son-in-law Karl Niederheim are recorded on the 1798 census of Schaffhausen in Household No. Sh16.
There are no known surviving male lines of this Träger family among the Volga German colonies.
- Mai, Brent Alan. 1798 Census of the German Colonies along the Volga: Economy, Population, and Agriculture (Lincoln, NE: American Historical Society of Germans from Russia, 1999): Sh16.