"Россия, дубликаты Лютеранских метрических книг, 1833-1885," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:QVRK-TC6X : 11 February 2018), Magdalena Helm in entry for Johann Jakob Thurn, 27 Aug 1833, Baptism; citing p. 165, volume 828-14/2...
"Россия Рождения и крещения, 1755-1917," database, FamilySearch (https://familysearch.org/ark:/61903/1:1:XTDC-86R : 11 February 2018), Magdalena Helm in entry for Christina Barbara Thurn, 20 Jun 1835; citing , reference p195-97; FHL microfilm 1,882,645.
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