The widow and children of Christian Block are recorded on the 1798 census of Galka in Households No. Gk30 & Gk31.
- 1834 Galka Census (Households No. 40, 172).
- 1857 Galka Census (Households No. 55, 216).
- 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): Gk30, Gk31.