Mary was listed as 17 years old on the 1880 Census; 37 on the 1900 Census.
In 1910 Mary was listed as 40 single, living with her widowed father in Lincoln, Iowa.
Died without issue in 1934 in Calhoun, Iowa, after she fell at home and struck her head.
Sources
1880 US Census. Mona Twp, Ford, Illinois, 10 Jun 1880; Roll: 206; Page: 354A; Enumeration District: 112. Ancestry Record 6742 #46654078
John Herbert 40, b. Ireland abt. 1840
Margaret 40, b. Ireland abt. 1840
Mary 17, b. NY, abt. 1863
Elizabeth 16, b. NY abt. 1864
Margaret 15, b. NY abt. 1865
John 13, b. Illinois abt. 1867
Edward 12, b. Illinois abt. 1868
1900 US Census. Lincoln, Calhoun, Iowa, 7 Jul 1900. John Herbert 59 b. Jun 1840 in Ireland, Immigration abt. 1860. Married abt. 1860. Both parents b. Ireland. Margaret 58, b. May 1841 in Ireland; daughter Mary 37, b. Oct 1852 in NY; son Edward E Herbert 30. b. Apr 1870 Illinois
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