In 1789, Johannes Heinrich Hacks moved from Volmer to Leichtling.
In 1794, Peter Heinrich Hacks moved from Volmer to Seelmann.
Nikolaus Hacks and his family are recorded on the 1798 census of Volmer in Household No. 43.
Johannes Heinrich [Hacks] from Volmer and his family are recorded on the 1798 census of Leichtling in Household No. Lg40.
- 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): Lg40, Vm43, Mv2922, Mv2940.