Johann Keller and his family are recorded on the 1775 census of Beideck in Household No. 58.
- 1775 Census of Beideck (No. 58).
- 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): Bd52.