My instinct is to follow the least common name Halliday in the following and see how they work out.
These are volume references for the named family trees as follows CUNNINGHAM 1p130 Church Hill, 14p209, 15p45, 24p28 Macedon, 52 Down Armagh, 54.HALLIDAY 7p171, MAXWELL 17n, 43T, 79 Waring, 91. The volumes are in Blackwood Family history manuscript trees in LinenHall library, Belfast.
I suggest you ask them for photocopying estimates if they think your knowledge relevant and be prepared to pay the extra for post and packing. However if the material is really relevant when you get it, I suggest a further donation to this unique library that is always needing extra funds. Linen Hall Library,17 Donegall Square North, Belfast BT15GB, Northern Ireland, Telephone: +44 (0)28 9032 1707, Fax: +44 (0)28 9043 8586, Email:info[at]linenhall.com.
Good luck, Jim