According to Anna (Brown) Neff's Tombstone at the Monroe United Methodist Church Cemetery in Shelby County, Iowa, she died on 10 August, 1882 when she was 72 years, 5 months and 12 days. This would mean she was born on 29 February, 1810.
From Find A Grave:
Anna Brown was the daughter of Samuel A. Brown and Jane Ripley. When her father died her mother remarried Gideon Burdick.
Sources
New York, Erie County Census 1855, 1865, 1875. Alden Thru Collins
Archive Rollname, 1855 Buffalo Census 1. Online Repository: Ancestry.com.
[Per this 1855 NY Census, Anna and Laomi were living in Cheektowago Township, NY.]
The Descendants of William Neff Who Married Mary Corliss: January 23, 1665, Haverhill, Massachusetts, compiled by Dorothy Neff Curry, 1899-1958. Published May 1958. Repository: Ancestry.com, and online at https://babel.hathitrust.org/cgi/pt?id=wu.89062860325;view=2up;seq=1. Pages 164-165. [Ancestor #145, Loami's Bible is mentioned in Ancestor #526.]
A photo of Anna's gravestone is online at Iowa Gravestones. It shows that she died on August 10, 1882, and that she was "72 years 5 months and 12 days."
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