In the 1870s John O'Shaughnessy owned almost 400 acres in county Roscommon.
Contemporary printed sources
- ''GRIFFITH'S VALUATION OF IRELAND'[Primary Valuation of Tenements]', 1850-1858. : Ballinasloe Union, 11 (Birch Grove)
- PARLIAMENTARY PAPERS. ''Return of owners of land of one acre and upwards, in the several counties .... in Ireland''. HC 1876, LXXX: 318 (Roscommon)
- LEWIS, Samuel. ''A Topographical Dictionary of Ireland''. London: S. Lewis & Co., 1837: Vol I, 432.
- SLATER, Isaac. ''Royal National Directory of Ireland: List of the principal seats''. (Manchester: 1894) : xxiii, 43