↑ 1798 Walter Census, No. 2862 A Description of the Saratov Colony of Grechinaya Luka also known as Walter, no. 143; American Historical Society of Germans from Russia, Lincoln, NE, USA. Published 1996. Page 7 Register, Family #28 Burgardt, Nikolaus, total of 4 males and 6 females in household.
↑ 1834 Census of Walter in the District of Saratov, Russia, Dated 10 November 1834; Translated by Dr. Brent Mai, Fairfield University, Fairfield CT; Dynasty Publishing, Fairfield, CT; Published 2016; page 20, family #76, lines 669-682, Nikolaus Burghardt.