Widow Barbara Wagner and her sons (Christian, age 6½; Johann Peter, age 4) are recorded on an appendix to the 1775 census of the Volga German colony of Schilling in Household No. 7 along with her stepdaughter Katharina (age 18) whose surname is not recorded.
- 1775 Schilling Census Appendix (No. 7).
- Mai, Brent Alan. 1798 Census of the German Colonies along the Volga (Lincoln, NE: American Historical Society of Germans from Russia, 1999): Sg043.