| RHP11612 | Plan of intended road from Huna (Houna) Inn to the town of Thurso. | 1798 |
| RHP13143 | Sketch plan of Scarfskerry Creek: 1891. | 1891 |
| RHP22348 | Sketch plan of ground in controversy between West Murza (Mursay), belonging to Bowermadden, and East Murza, belonging to Ratter, near to the Quoy Burn and Mill of Murza | Early 19th century |
| RHP22349 | Sketch plan of the moss of Nether Greenland | Early 19th century |
| RHP22351 | Sketch plan of harbour at Dwarwick (Dwarick). (With remarks thereon). | 1813 |
| RHP22356 | Sketch plan of lands adjoining Loch Heilen (Loch of Hayland). (Draft letter on reverse). | 19th century |
| RHP34164 | Admiralty chart of Pentland Firth. | 1901 |
| RHP43581 | Ordnance Survey 1/2500 plan (Caithness sheet I.15), marked to show occupiers in part of Brough and march between Freswick and Rattar. | 1873 |
| RHP43654 | Plan of county road near Sand-End Road, Dunnet, showing site of accident. | 1935 |
| RHP43667 | Ordnance Survey 1/2500 plan (Caithness sheet I.16) marked to show proposed enlargements of holdings on farm of Ham. | 1913 |
| RHP43669 | Ordnance Survey 1/2500 plan marked to show proposed enlargement of holdings on farm of Greenvale. | 1913 |
| RHP43670 | Ordnance Survey 1/2500 plan (caithness sheet II.13) marked to show proposed new and enlarged holdings on farm of Rattar Mains. | 1913 |
| RHP78983 | Ordnance Survey 6 inch plan (Caithness, sheet XII) marked to show farm boundaries | [1944-1955] |
| RHP78984 | Ordnance Survey 6 inch plan (Caithness, sheet XIII) marked to show farm boundaries | [1944-1955] |
| RHP79520 | Ordnance Survey 6 inch plan (Caithness, sheet I) marked to show farm boundaries: [1944 x 1954] | nd |
| RHP79521 | Ordnance Survey 6 inch plan (Caithness, sheets IIA & II) marked to show farm boundaries: [1944 x 1954] | nd |
| RHP79525 | Ordnance Survey 6 inch plan (Caithness, sheet VI) marked to show farm boundaries: [1944 x 1954] | nd |
| RHP79526 | Ordnance Survey 6 inch plan (Caithness, sheet VII) marked to show farm boundaries: [1944 x 1954] | nd |
| RHP97556 | Ordnance Survey 6 inch plan (Caithness, sheet I) coloured and marked to show classification of land | [1944-1954] |
| RHP97557 | Ordnance Survey 6 inch plan (Caithness, sheets IIA & II) coloured and marked to show classification of land | [1944-1954] |