Johannes Gassmann, a farmer, and his family settled in the Volga German colony of Mariental on 15 July 1766. They are recorded there on the 1767 census in Household No. 81.
The 1767 census records that Johannes Gassmann came from the German village of Weissenburg in France.
- 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): Mt13, Mt40.
- Pleve, Igor. Einwanderung in das Wolgagebiet, 1764-1767 Band 3 (Göttingen: Göttinger Arbeitskreis, 2005): 115.