Gottlieb Brühan from Merkel and his family are recorded on the 1798 census of Kolb in Household No. Ko08.
The death of Gottlieb Brühan in 1829 is recorded on the 1834 census of Kolb in Household No. 104.
- 1834 Kolb Census (Household No. 104).
- 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): Ko08.