Johann Adam Kaufmann, a farmer, and his wife Katharina Rosina settled in the Volga German colony of Shcherbakovka on 15 June 1765.
They are recorded there on the 1767 census in Household No. 24.
The 1798 census of Frank records the children of Adam Kaufmann from Shcherbakovka in Household No. Fk089.
The 1767 census records that Johann Adam Kaufmann came from the German region of Aßling [?].
Eichhorn book records that a Johann Adam Kaufmann from the Principality of Hohenlohe immigrated to Denmark (Schleswig-Holstein) in 1762, but it has not been confirmed that this is the same Johann Adam Kaufmann who eventually settled in the Volga German colony of Shcherbakovka.
- Eichhorn, Alexander, Jacob & Mary Eichhorn. The Immigration of German Colonists to Denmark and Their Subsequent Emigration to Russia in the Years 1759-1766 (Deiningen, Germany: Drukerei und Verlag Steinmeier GmbH & Co. Kg, 2012): B-781.
- 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): Fk089.
- Pleve, Igor. Einwanderung in das Wolgagebiet, 1764-1767 Band 4 (Göttingen: Göttinger Arbeitskreis, 2008): 251.