About 800 maps of the estates of the Stewart family, Marquises of Londonderry, in the Comber, Newtownards and Florida areas, Co. Down, including maps by John Sloane in the 1720's, by D. Geddes in the late 18th c., plans of buildings in Newtownards, Mountstewart demesne, Strangford Lough reclamation, roads etc. 1721 - c. 1850.

Míreanna comhchosúla

• Letters, accounts, maps, etc. relating to land reclamation at Ballykelly, Co. Derry, 1838 - c. 1900. Speeches and correspondence of James Drennan on tenant right and support of liberals, 1874 - 88.
• Copy of town-plan of Newtownards, Colville estate, c. 1720. Copy of town-plan of Newtownards, c. 1830. Printed address of G. Harrison to the Newtownards Mining Co., 1846. Pencil sketch of Scrabo Tower, Newtownards c. 1870.
• Clare slob reclamation, including labourers employed, 1885-6, tide tables, 1885-7, graphs, drawings, etc.
• About 700 maps of the estates of the Hill family, Marquises of Downshire in many areas of Co. Down and places in Blessington, Carrickfergus, and Edenderry areas, including maps of roads, railways, canals, etc., 18th to 20th c.
• 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.