1880 United States Federal Census, Database online. Stillwater, Washington, Minnesota, ED 33, roll T9_637, page 254.1000, image 0108.Record for Nicholas F. Schwarz
1900 United States Federal Census, Database online. Stillwater Ward 2, Washington, Minnesota, ED , roll , page .Record for Nicholas F Schwarz
1860 United States Federal Census, Database online. Year: 1860; Census Place: Stillwater, Washington, Minnesota; Roll: ; Page: ; Image: .Record for Caroline Otto
1870 United States Federal Census, Database online. Year: 1870; Census Place: Grant, Washington, Minnesota; Roll: M593_; Page: ; Image: .Record for Caroline Otto