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- [S12] Ancestry.com and The Church of Jesus Christ of Latter-day Saints, 1880 United States Federal Census, (Ancestry.com Operations Inc), Year: 1880; Census Place: Manheim, Lancaster, Pennsylvania; Roll: 1141; Page: 207B; Enumeration District: 131 (Reliability: 0).
- [S10] Ancestry.com, 1900 United States Federal Census, (Ancestry.com Operations Inc), Year: 1900; Census Place: Sparrows Point, Baltimore City (Independent City), Maryland; Page: 21; Enumeration District: 0061; FHL microfilm: 1240607 (Reliability: 0).
- [S209] Ancestry.com, 1910 United States Federal Census, (Ancestry.com Operations Inc), Year: 1910; Census Place: Election District 15, Baltimore, Maryland; Roll: T624_552; Page: 11B; Enumeration District: 0063; FHL microfilm: 1374565 (Reliability: 0).
- [S116] Ancestry.com, 1920 United States Federal Census, (Ancestry.com Operations, Inc.), Year: 1920; Census Place: Upper Hanover, Montgomery, Pennsylvania; Roll: T625_1605; Page: 4B; Enumeration District: 182 (Reliability: 0).
- [S138] Ancestry.com, Website: Find A Grave Index, 1600s-Current, (Ancestry.com Operations, Inc.) (Reliability: 0).
- [S193] Ancestry.com, 1930 United States Federal Census, (Ancestry.com Operations Inc), Year: 1930; Census Place: Spring, Berks, Pennsylvania; Page: 21A; Enumeration District: 0145; FHL microfilm: 2341734 (Reliability: 0).
- [S191] Ancestry.com, 1940 United States Federal Census, (Ancestry.com Operations, Inc.), Year: 1940; Census Place: Spring, Berks, Pennsylvania; Roll: m-t0627-03435; Page: 8A; Enumeration District: 6-91 (Reliability: 0).
- [S64] Website: Find a Grave [text], https://www.findagrave.com/memorial/56966945/charles-b-hackman.
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