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- Allied Irish Bank PLC
- Armagh County Museum
- Armagh Robinson Library
- Bank of Ireland Archives
- Bibliothèque nationale de France (Paris)
- Bodleian Libraries (Oxford)
- British Library (London)
- CIRCLE: A Calendar of Irish Chancery Letters, 1244–1509
- Cambridge Gonville and Caius
- Cambridge St John's College
- Cambridge Trinity College
- Cambridge University Library
- Catholic Historical Society of Ireland
- Central Bank of Ireland Archive (Dublin)
- Cloyne Literary and Historical Society
- College of Arms (London)
- Columbia University, Law Library
- Cork City Libraries
- Donegal County Archives (Lifford)
- Donegal County Libraries
- Dublin City Library and Archive
- Dublin Gazette
- Enhanced Parliamentary Papers Ireland
- Ferns Diocesan Archive (Wexford)
- Guinness Archive (Dublin)
- Harvard University, Houghton Library
- Historical Society of Pennsylvania
- Huguenot Society of London
- Huntington Library, San Marino, California
- Irish Capuchin Archives
- Irish Genealogical Research Society
- Irish Manuscripts Commission
- Irish Record Commission (active 1810–30) Publications
- John Rylands Library (Manchester)
- Kenneth Spencer Research Library, University of Kansas
- Kent Archives and Local History
- Killruddery House
- King's Inns Library (Dublin)
- L. Brown Maps and Charts Collection
- Lambeth Palace Library (London)
- Library Company of Philadelphia
- Library of Congress (Washington DC)
- Longford County Library and Archives Service
- Marsh's Library (Dublin)
- Military Archives (Dublin)
- Monksgrange Archives
- Museum of the Order of St John (London)
- National Archives, Ireland
- National Library of Australia
- National Library of Ireland
- Northamptonshire Record Office
- Oireachtas Library (Dublin)
- Oxfordshire History Centre
- Parish Register Society of Dublin
- Parliamentary Archives, UK Parliament (Westminster)
- Philip Maddock Collection
- Public Record Office of Ireland (Reconstruction of Collections Destroyed, 1922)
- Public Record Office of Northern Ireland
- Published Sources
- Representative Church Body Library (Dublin)
- Royal College of Physicians of Ireland
- Royal Irish Academy
- Royal Society of Antiquaries of Ireland
- Sligo County Libraries
- Tailte Éireann, Registry of Deeds (Dublin)
- The National Archives (UK)
- Trinity College Dublin, Manuscripts and Archives Research Library
- Tullynally House
- University College Cork
- Virtual Record Treasury of Ireland
- Waterford City and County Archives Service
- Wexford County Archive
- Wicklow County Archives, Wicklow Town, Co. Wicklow
- Yale, Lewis Walpole Library
