Adam Siebert (age 9) is recorded on an appendix to the 1767 census of Boisroux in Household No. 34 along with the Christian Sorgenfrey family and a note that they settled in the Volga German colony of Nieder-Monjou in 1768.
Adam Siebert and his family are recorded on the 1798 census of Zürich in Household No. Zr01.
The 1767 census does not record from where Adam Siebert came.
- 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): Zr01.
- Pleve, Igor. Einwanderung in das Wolgagebiet, 1764-1767 Band 1 (Göttingen: Göttinger Arbeitskreis, 1999): 168.