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- [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.
- [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: John Fred Ludwig;
Gender: Male;
Race: White;
Birth Date: 22 Dec 1879;
Birth Place: Bay View Eri, New York;
Father: Fred Ludwig;
Mother: Mary R Blohm;
SSN: 713186653;
Notes: May 1937: Name listed as JOHN FRED LUDWIG
- [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.
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