| Sources |
- [S1640034025] Ancestry.com, 1920 United States Federal Census, (Ancestry.com Operations, Inc.).
- [S1656161411] Ancestry.com, U.S., World War I Draft Registration Cards, 1917-1918, (Ancestry.com Operations Inc), Registration State: Ohio; Registration County: Union County.
- [S1640033450] Ancestry.com, U.S., Find A Grave Index, 1600s-Current, (Ancestry.com Operations, Inc.).
- [S1640033586] Ancestry.com, Newspapers.com Obituary Index, 1800s-current, (Ancestry.com Operations Inc), The Union County Journal; Publication Date: 16 Aug 1921; Publication Place: Marysville, Ohio, USA; URL: https://www.newspapers.com/image/324680906/?article=7d9ddd9b-2e63-41e3-a511-806f1af1e126&focus=0.50972486,0.50119656,0.66511524,0.8546517&xid=3355.
- [S1666638170] Newspapers.com - The Union County Journal - 16 Aug 1921 - Page 1, (The Union County Journal), Obituary for Ernest Schwartzkopf 16 Aug 1921.
- [S1640045312] Ancestry.com, 1900 United States Federal Census, (Ancestry.com Operations Inc).
- [S1640045312] Ancestry.com, 1900 United States Federal Census, (Ancestry.com Operations Inc), Year: 1900; Census Place: Darby, Union, Ohio; Page: 11; Enumeration District: 0132; FHL microfilm: 1241328.
|