↑ 1.01.1 Year: 1900; Census Place: Buckeystown, Frederick, Maryland; Page: 8; Enumeration District: 0002; FHL microfilm: 1240622 : Source Information Ancestry.com. 1900 United States Federal Census [database on-line]. Provo, UT, USA: Ancestry.com Operations Inc, 2004. Ancestry Record 7602 #80331014.
↑ 2.02.1 Ancestry.com. U.S., Social Security Applications and Claims Index, 1936-2007 [database on-line]. Provo, UT, USA: Ancestry.com Operations, Inc., 2015.
Ancestry Record 60901 #2904634.
↑The Frederick Post, Frederick, Maryland, 3 Apr 1947, p. 4. Source Information: Ancestry.com. The Frederick Post (Frederick, Maryland) [database on-line]. Provo, UT, USA: Ancestry.com Operations Inc, 2006. See Image.
↑ Find A Grave, database and images (Find A Grave) : accessed 11 May 2019), memorial page for David O Hoffman (1871–1947), Find A Grave: Memorial #23539548, citing Mount Olivet Cemetery, Frederick, Frederick County, Maryland, USA ; Maintained by Kim K (contributor 46955000) .
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