- Three Celtic Earldoms: Atholl, Strathearn, Menteith
- The Lord Chancellors of Scotland, From the Institution of the Office to the Treaty of Union; Volume 2
- The Royal House of Stuart: From Its Origin to the Accession of the House of Hanover; Volume 1
- The Ruthven Family Papers; the Ruthven Version of the Conspiracy and Assassination at Gowrie House, Perth, 5th August, 1600, Critically Rev. and Edited by Samuel Cowan
- The Lord Chancellors of Scotland, From the Institution of the Office to the Treaty of Union; Volume 1