Balthasar Kelker, an orphan (age 18), settled in the Volga German colony of Dönhof on 18 June 1767. He is recorded there on the 1767 census in Household No. 99 along with his sister Margaretha (age 24) and her husband Kaspar Nuss.
- Pleve, Igor. Einwanderung in das Wolgagebiet, 1764-1767 Band 1 (Göttingen: Göttinger Arbeitskreis, 1999): 368.