Harper Campbell developed extensive business interests in Sligo in the 19th century. The family resided at "the Hermitage" until it was purchased from them by Sligo Grammer School c.1947. The Campbell estate also held significant property around the town of Ballysadare, including 150 acres of untenanted land in 1906. They also held lands in the barony of Tireragh. The Congested Districts Board later acquired over 300 acres of the Campbell estate.
Contemporary printed sources
- PARLIAMENTARY PAPERS. ''Return of owners of land of one acre and upwards, in the several counties .... in Ireland''. HC 1876, LXXX: 320
- PARLIAMENTARY PAPERS. ''Return of Untenanted Lands in Rural Districts, Distinguishing Demesnes on Which There is a Mansion...'', HC 1906, c, 177: 392.
- ''GRIFFITH'S VALUATION OF IRELAND'[Primary Valuation of Tenements]', 1850-1858. : Sligo Union, 130.
Modern printed sources
- ''Corran Herald'': DUFFY, P.J. The Congested Districts Board (including list of lands acquired in county Sligo under the Wyndham Act). XXXIV (2001-2002), 6-7.
- McTERNAN, John C. ''Sligo: the light of bygone days, Vol.I Houses of Sligo and associated families''. Sligo: Avena Publications, 2009. : 99-100
- McTERNAN, John C. ''The light of bygone days, Volume II: Sligo families''. Sligo: Avena Publications, 2009. : 22-25