Bernhard Keller and his family are recorded on the 1798 census of Näb in Household No. Nb39 along with a note that he has remarried and is living in the colony of Zürich.
His divorced wife Gertrude is recorded on the 1798 census of Näb in Household No. Nb40 along with a note that she and her illegitimate children are living in the colony of Reinwald where she has been hired to work.
- 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): Nb39, Nb40.