Kaspar Grünewald (age 20) settled in the Volga German colony of Kukkus on 26 June 1767. He is recorded there on the 1767 census in Household No. 40 along with the family of Johannes Berger. No relationship between Kaspar Grünewald and Johannes Berger is recorded.
- Pleve, Igor. Einwanderung in das Wolgagebiet, 1764-1767 Band 2 (Göttingen: Göttinger Arbeitskreis, 2001): 471.