Among the papers of the Robertsons the chief correspondents are Principal William Robertson, the historian, and his son William, a Senator of the College of Justice. The correspondence of the Principal includes letters of scholars, British and foreign (Voltaire among others), about his works, information on the American Indians, 1774-1777, and threats regarding his attitude to Roman Catholics, 1778-1779. That of Lord Robertson deals with his legal and political activities and the publication of his father's works.

The papers of the Macdonalds and Robertson-Macdonalds deal chiefly with the estate of Kinlochmoidart, forfeited on account of the part played by the Chief in the rising of 1745 and restored in 1784, the farming and leasing of the lands, debts, relations with other land-owners, projects for roads, the building of an Episcopalian chapel, etc. They also include letters on the military experiences of successive Chiefs - of Alexander in America, 1775-1780, of Donald in the West Indies, where he became Governor of Tobago, 1800-1805, and of David Robertson, afterwards Robertson-Macdonald, in Ceylon, 1797-1803.