1834 Census of Grimm in the District of Saratov, Russia, dated 2 February 1835; Translated by Brent Mai, Concordia University, Portland, Oregon; Published by Dynasty Publishing, Beaverton, OR, USA; Published 2011; page 10, family #29, line 293, Heinrich Adolph Kappel, age 33.
1857 Census of Grimm in the District of Saratov, Russia, dated 5 November 1857; Translated by Brent Mai, Concordia University, Portland, Oregon; Published by Dynasty Publishing, Beaverton, OR, USA; Published 2005; page 13, family #31, line 466, heinrich Adolph Happel, age 49 in 1850, deceased 1856.
J. N. Hays (2005). Epidemics and pandemics: their impacts on human history. ABC-CLIO. ISBN 978-1-85109-658-9. Retrieved 29 March 2011. Via Wikipedia List of epidemics, Russia, 1850-1860, third cholera pandemic, 1,000,000 deaths. See: https://en.wikipedia.org/wiki/List_of_epidemics.
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