Karl Eulenberg and his family are recorded on the 1798 census of Dobrinka in Household No. Db56.
The death of Karl Eulenberg in 1818 is recorded on the 1834 census of Dobrinka in Household No. 77.
There are no known surviving male lines of this family among the Volga German colonies.
- 1834 Dobrinka Census (Household No. 77).
- 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): Db56.