Johannes Gebhardt and his family are recorded on the 1798 census of Pfeifer in Household No. Pf53.
The death of Johannes Gebhardt in 1827 is recorded on the 1834 census of Pfeifer in Household No. 110.
- 1834 Pfeifer Census (Household No. 110).
- 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): Pf53.