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 death of Martin Schäfer in 1821 is recorded on the 1834 census of Zürich in Household No. 69.
The 1767 census does not record from where the Schäfer children came.
- 1834 Zürich Census (Household No. 69).
- 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: Der Göttinger Arbeitskreis, 2005): 198.