Martin Lehmann (age 14) and his sister Maria (age 15) are recorded on the 1767 census of Bettinger in Household No. 19 along with their stepfather Jakob Hildebrandt.
The 1767 census does not record from where the Lehmann children came.
- Mai, Brent Alan. 1798 Census of the German Colonies along the Volga (Lincoln, NE: American Historical Society of Germans from Russia, 1999): Bt01.
- Pleve, Igor. Einwanderung in das Wolgagebiet 1764-1767 Band 1 (Goettingen: Der Göttinger Arbeitskreis, 1999): 135.