Christina Bolgert (age 17) and her sister Anna Elisabeth Bolgert (age 15), daughters of the deceased Johann Bolgert, are recorded on the 1798 census of Stahl am Karaman in Household No. Sk35.
There are no known surviving male lines of this 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): Sk35.