Heinrich Bickart and his family are recorded on the 1798 census of Preuss in Household No. Ps78.
Some translations record this surname as Picard, but contemporary generations use the surname of Bickart.
- 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): Ps78.