Hans Wilhelm Kretz, a craftsman (Handwerker), and his family settled in the Volga German colony of Dobrinka on 29 June 1766. They are recorded there on the 1767 census in Household No. 60.
Johann Georg Kretz is recorded on the 1798 census of Holstein in Household No. Ho26 and is believed to be from Dobrinka.
In 1833, Johann Heinrich Kretz moved from Dobrinka to Galka.
Johann Heinrich Kretz and his family are recorded on the 1834 census of Galka in Household No. 31 along with a note that they had arrived in Galka from Dobrinka in 1833.
Heinrich Kretz and his family are recorded on the 1850 census of Galka in Household No. 43.
Georg Heinrich Kretz and his family are recorded on the 1857 census of Galka in Household No. 45.
The 1767 census records that Hans Wilhelm Kretz came from the German town of Kiel in the region of Holstein.
- 1834 Galka Census (Household No. 31).
- 1850 Galka Census (Household No. 43).
- 1857 Galka Census (Household No. 45).
- 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): Ho26.
- Pleve, Igor. Einwanderung in das Wolgagebiet, 1764-1767 Band 1 (Göttingen: Der Göttinger Arbeitskreis, 1999): 329.
Brent Mai