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- [S512] Ancestry.com, New York, Erie County Census 1855, 1865, 1875, (Name: Ancestry.com Operations, Inc.; Location: Provo, UT, USA; Date: 2011;), Lancaster Thru West Seneca.
- [S9] Ancestry.com, 1900 United States Federal Census, (Name: Ancestry.com Operations Inc; Location: Provo, UT, USA; Date: 2004;), Year: 1900; Census Place: Hamburg, Erie, New York; Page: 3; Enumeration District: 0246; FHL microfilm: 1241033.
- [S7] Ancestry.com and The Church of Jesus Christ of Latter-day Saints, 1880 United States Federal Census, (Name: Ancestry.com Operations Inc; Location: Lehi, UT, USA; Date: 2010;), Year: 1880; Census Place: Hamburgh, Erie, New York; Roll: 827; Page: 403D; Enumeration District: 095.
- [S10] Ancestry.com, Pennsylvania, Death Certificates, 1906-1966, (Name: Ancestry.com Operations, Inc.; Location: Provo, UT, USA; Date: 2014;), Pennsylvania Historic and Museum Commission; Pennsylvania, USA; Pennsylvania (State). Death certificates, 1906–1966; Certificate Number Range: 058501-061500.
- [S12] Ancestry.com, U.S., Social Security Applications and Claims Index, 1936-2007, (Name: Ancestry.com Operations, Inc.; Location: Provo, UT, USA; Date: 2015;), U.S., Social Security Applications and Claims Index, 1936-2007.
Name: Mary R Blohm;
Gender: Female;
Spouse: Fred Ludwig;
Child: John Fred Ludwig
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