Mary O'Brien held 4 townlands in the parish of Uskane, barony of Lower Ormond, county Tipperary, in the mid 19th century. Mrs Mary O'Brien of England owned 805 acres in county Tipperary in the 1870s.
National Library of Ireland:
Baptismal certificate of Daniel O'Brien, parish of Ardfinnan, Co. Tipperary, 7 Mar. 1839, also letter from Anne Butler to her sister Mary O'Brien, [20 Dec. 1886.]
William O'Brien Papers, Ms. 20,761