Martin Schäfer (age 15) and his sister Zizilia (age 10) are recorded on the 1767 census of Nieder-Monjou in Household No. 59 along with their stepfather Christian Bisterfeld. They had settled there on 3 August 1767.
The 1798 census of Zürich records Martin Schäfer from Nieder-Monjou in Household No. Zr36.
The 1767 census does not record from where the Schäfer children 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): Zr36.
- Pleve, Igor. Einwanderung in das Wolgagebiet, 1764-1767 Band 3 (Göttingen: Göttinger Arbeitskreis, 2005): 198.