Johann Georg Mai, his wife Elisabeth, and their daughters (Katharina, age 4½; Louisa, age 1) are recorded on the 1775 census of the Volga German colony of Schilling in Household No. 78.
- 1775 Census of Schilling (No. 78).
- 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): Sg086.