About 1000 documents, being deeds, wills, etc., relating to the estates of the Stewart family, Marquises of Londonderry, in Counties Down, Donegal and Derry, c. 1670-1850.

Míreanna comhchosúla

• About 2,500 leases relating to the estates of the Stewart family, Marquises of Londonderry mostly for the Comber, Newtownards and Florida estates, Co. Down, but with a few for the Donegal and Derry estates, late 17th to 19th century.
• Pedigree of the Stewarts of Ballylawn, Co. Donegal, now Marquesses of Londonderry.
  de réir: Stewart, W. A.
  Foilsithe / Cruthaithe: (1937)
• Pedigree of the Stewarts of Ballylawn, Co. Donegal, now Marquesses of Londonderry.
  de réir: MacGregor, John
  Foilsithe / Cruthaithe: (1937)
• Account books, ledgers, rentals, correspondence etc. relating to the estates of the Stewart family, Marquises of London-derry, mainly in Co. Down, with rental of Comber, 1684, accounts of Strangford Lough reclamation, 19th c., Cunningburn Mill, 1808-9, 18th to 20th c.
• Papers relating to mines in the Newtownards estate of the Marquis of Londonderry, Journal of Bangor and Newtown lead mine, 1780-1782, Craiganu slate quarry, 1807-18. Inventories of furniture Mountstewart House, etc. Cotton spinner's account book, Newtownards, 1807-11.