At the time of Griffith's Valuation William John Birch (sometime written John William Birch) held the salmon fishery in Tallaghan Bay in the parish of Kilcommon, barony of Erris, county Mayo. William John Birch bought 5,829 acres of the O'Donel estate near Ballycroy in the early 1850s and resold it to the Clive family of Herefordshire. However it appears that the Birch family retained an interest in the property as Henry Coulter refers to a county court judge named Birch who held a large farm from Clive of Ballycroy.
- Westport Estate Papers, Collection List 78; National Library of Ireland
Contemporary printed sources
- COULTER, Henry. ''The West of Ireland: its existing condition and prospects''. Dublin: Hodges and Smith, 1862: 211
Modern printed sources
- MULLOWNEY, Peter. ''The expansion and decline of the O'Donel estate Newport, Co Mayo, 1785-1852''. M.A. thesis, NUI, Maynooth, 2002: Appendix 2
- ''Jnl. of the Galway Archaeological and Historical Society'': LANE, Pádraig G. The General Impact of the Encumbered Estates Act of 1849 on Counties Galway and Mayo. XXXIII (1972), 44-74