Philipp Weltz and his wife Katharina are recorded on the 1775 census of the Volga German colony of Schilling in Household No. 85 along with his daughter (Barbara, age 1½) and stepsons Christian Schargenus (age 7½) and Ambrosius Schargenus (age 5). Katharina is the widow of Johann Schargenus with whom she had arrived from Lübeck at the port of Oranienbaum on 4 July 1766 aboard the English frigate Love & Unity under the command of Skipper Thomas Fairfax.
Researcher "Habermann" on the forum of wolgadeutsche.net reports that Barbara, daughter of Johann Philipp Wels & Katharina Roth, was born in Schilling on 12 September 1774.
- 1775 Census of Schilling (No. 85).
- ГИАНП, Ф.263 Оп.2 Д.1, стр.30.
- 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): Sg085.
- Pleve, Igor. Lists of Colonists to Russia in 1766: Reports by Ivan Kulberg (Saratov: Saratov State Technical University, 2010): #1665.