| RHP4287 | Plan of the location of Skerray Harbour, Tongue, Sutherland | [1888] |
| RHP4288 | Tracing plan of the location of Skerray Harbour, Tongue, Sutherland | 1888 |
| RHP5205 | Plans, elevations and sections (2) of proposed harbour at Talmine. | 1893 |
| RHP11592 | Plan of intended road from the Kirk of Durness to the head of Loch Naver, Sutherland | 1790 |
| RHP11600 | Plan of intended roads from Tongue to Portinleck on the Dornoch Firth and from Tongue to Kirk of Farr and thence up Strathnaver to join the Portinleck line of road at the head of Loch Naver. | 1794 |
| RHP11657 | Plan of proposed road from Tongue to Creich | 1809 |
| RHP13145 | Sketch plan of Skullomie (Scullomy) Harbour: 1891. | 1891 |
| RHP13146 | Sketch plan of Skerray Creek, showing proposed new pier: 1891. | 1891 |
| RHP13148 | Sketch plan of Talmine Bay, showing proposed breakwater and pier: 1891. | 1891 |
| RHP38304 | Ordnance Survey 6 inch plan marked to show Kinloch Forest, Ribigill Forest and Loyal Forest4. | nd |
| RHP38305 | Ordnance Survey 1/25000 plan marked to show estate boundaries and suitability for afforestation. | nd |
| RHP38309 | Ordnance Survey 1 inch map marked to show estate and farm boundaries. | 1963 |
| RHP42767 | Architectural plan and elevation of a house at Lettermore where Kenneth Campbell murdered his wife on 20 June 1868. | 25 Jun 1868 |
| RHP79353 | Ordnance Survey 6 inch plan (Sutherland, sheet VII) marked to show farm boundaries | [1944-1955] |
| RHP79354 | Ordnance Survey 6 inch plan (Sutherland, sheet VIII) marked to show farm boundaries | [1944-1955] |
| RHP79362 | Ordnance Survey 6 inch plan (Sutherland, sheet XVI) marked to show farm boundaries | [1944-1955] |
| RHP79364 | Ordnance Survey 6 inch plan (Sutherland, sheet XVIII) marked to show farm boundaries | [1944-1955] |
| RHP79370 | Ordnance Survey 6 inch plan (Sutherland, sheet XXV) marked to show farm boundaries | [1944-1955] |
| RHP79371 | Ordnance Survey 6 inch plan (Sutherland, sheet XXVI) marked to show farm boundaries | [1944-1955] |
| RHP79377 | Ordnance Survey 6 inch plan (Sutherland, sheet XXXIII) marked to show farm boundaries | [1944-1955] |
| RHP79378 | Ordnance Survey 6 inch plan (Sutherland, sheet XXXIV) marked to show farm boundaries | [1944-1955] |
| RHP79379 | Ordnance Survey 6 inch plan (Sutherland, sheet XXXV) marked to show farm boundaries | [1944-1955] |
| RHP79385 | Ordnance Survey 6 inch plan (Sutherland, sheet XLIII) marked to show farm boundaries | [1944-1955] |
| RHP79386 | Ordnance Survey 6 inch plan (Sutherland, sheet XLIV) marked to show farm boundaries | [1944-1955] |
| RHP142498 | Plan of Borgie estate, Sutherland | 20 Feb 1935 |
| RHP143000/3/27 | Ordnance Survey 1 inch map (Sheet 114, [Tongue]) | 1880 |