Johannes Wohlhauer, a farmer, and his family settled in the Volga German colony of Shcherbakovka on 15 June 1765. They are recorded there on the 1767 census in Household No. 29.
The 1767 census records that Johannes Wohlhauer came from the German village of Saalburg.
- Pleve, Igor. Einwanderung in das Wolgagebiet, 1764-1767 Band 4 (Göttingen: Göttinger Arbeitskreis, 2008): 252.