| RHP183 | Plan of the farms of Daltarre, Langwell, Badditagart, Baddichrieve and Rossel, belonging to Colonel Baillie of Rosehall, Sutherland | 1792 |
| RHP679 | Plan of the contraverted grazings of Fionauld, Sutherland | 1768 |
| RHP1453 | Plan of Balnagown Highland estates | 18 Feb 1846 |
| RHP4201 | Plan of ground between Lochs Migdale, Buidhe and Laro in dispute between W S Dempster of Skibo and H Houston of Creich, Creich, Sutherland | 1815 |
| RHP4202 | Plan (2 copies) of lands between lochs Migdal, Buidhe and Laro in dispute betwixt the proprietor of Skibo and the proprietor of Creich (see RHP4203) | 1812 |
| RHP4203 | Plan of lands between Lochs Migdal, Buidhe and Laro in dispute betwixt the proprietor of Skibo and the proprietor of Creich, Sutherland. | 1812 |
| RHP4204 | Plan of ground between Lochs Migdal, Buidhe and Laro in dispute between W S Dempster of Skibo and H Houston of Creich: 1815. | 1815 |
| RHP4205 | Plan of the Common between Migdale and Lochs Buidhe and Laro in process of division | 1825 |
| RHP5249 | Plan of the Mains of Pulrossie, etc in possession of J Salt, Esq. | 1765 |
| RHP6935/1 | Plan of the Water and Kyle of Oykel (Oykill), Sutherland | [1866] |
| RHP6935/2 | Plan of the junction of The Rivers Oykel and Cassley | Apr 1825 |
| RHP6935/3 | Envelope which contained RHP6935/2 | 1825 |
| RHP11594 | Plan of intended road from Ullapool to Portinliek alias Culrain. | 1790 |
| RHP11598 | Plan of intended road from Lochinver to Portinleik Ferry. | 1793 |
| 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 |
| RHP11603 | Plan of intended road from Portenleik Ferry at the head of the Dornoch Firth to Dunrobin Castle (continued to Dunbeath in Caithness) | 1794 |
| RHP11611 | Plan of road from the Ferry of Portenleik near Culrain along the west side of the Dornoch Firth to the town of Tain. | 1797 |
| RHP11655 | Plan of piers for Littleferry and Creich. | 1808 |
| RHP11656 | Plan of the different roads leading from Rhives to Bonar Ferry. | 1808 |
| RHP11657 | Plan of proposed road from Tongue to Creich | 1809 |
| RHP11667 | Plan of road from Lochinver in Assynt to the proposed Tongue Road at Invershin, with branches to Culkein and Unapool. | c 1812 |
| RHP12647 | Volume of plans of the estate of Pulrossie (from there to Maikle), the property of Captain John Dempster | 1790 |
| RHP129765-129766 | Two hand coloured contract drawings showing elevations plans and sections of masonry and ironwork for Oykel Viaduct between Culrain and Invershin (Sutherland Railway): annotated with the signatories to the contract | 1865 |
| RHP129767-129772 | Six drawings showing elevations, plans, sections and details of steelwork for renewal of Oykel Viaduct at Invershin (Highland Railway) | 1912-1917 |
| RHP129773-129774 | Two drawings showing elevations, plans, sections and details of steelwork for strengthening of floor of Oykel Viaduct Invershin (London Midland and Scottish Railway) | 1926 |
| RHP13466 | Plan showing obstruction erected in the Kyles of Sutherland: 1893. | 1893 |
| RHP14946 | Plan of the Dornoch Firth, showing the mussel scalps belonging to the estates to Tarlogie, Morangie and Cambuscurrie | 1848 |
| RHP15875 | Architectural plan, section and elevation of proposed agents' houses at Lindores, Luthrie and Kilmany (Newburgh and North Fife Railway): 1908 | 1908 |
| RHP17443 | Multiple Ordnance Survey 1 inch map sheets attached to show Lochinver and Altnaharrow | 1882 |
| RHP22562 | Plan of the marches between the Reay and Sutherland estates in the area between Ben Leoid and Fionn Loch Beag | 1822 |
| RHP36095 | Plan showing land occupied by the Sutherland Railway in the parish of Creich, held under a feu charter of November 1873 by the Duke of Sutherland and sold by him to Andrew Carnegie and spouse as from Martinmas 1898. | 1898 |
| RHP36097 | Sketch plan of Invershin station. | Late 19th century |
| RHP38679 | Tracing plan of regional water scheme between Lindifferon and Gauldry (Fife County Council). | c 1960 |
| RHP38719 | Plan illustrating the closure of branch lines and stations on the North Fife Branch, at St. Fort, Kilmany, Rathillet Siding, Luthrie, Ayton Siding, Lindores, Glenburnie Junction, Clatchard Craig Siding, Whin Park Sidings and Newburgh (British Railways). | 1956 |
| RHP39455/1-2 | Plan and elevation (2 copies) of the Oykel Viaduct over the Kyle of Sutherdland (British Railways). | c 1967 |
| RHP41098 | Plan of Bonar Bridge Station (London Midland And Scottish Railway). | 1923 |
| RHP44272 | Ordnance Survey 1 inch map (sheet 102) marked to show farms of Achany, Craggie (Creagach), Gruids and Sallachy (Sallachadh) with shooting-rights pertaining thereto. | 1894 |
| RHP48108 | Architectural plans, elevations and sections (2 sheets) of proposed dressing room and bathroom over cloakroom at Luthrie Bank | Mar 1911 |
| RHP48343 | Plans of proposed new approach road at Luthrie Bank, Creich, Sutherland | Mar 1911 |
| RHP49576 | 1. Plan of estate of Balmeadowside, with table of contents 2-3. Duplicates of no. 1 | 1881 |
| RHP49999 | Architectural plans, elevation and section of schoolhouse and schoolmaster's house for the parish of Creich, Sutherland | 1832 |
| RHP79413 | Ordnance Survey 6 inch plan (Sutherland, sheet LXXI) marked to show farm boundaries | [1944-1955] |
| RHP79414 | Ordnance Survey 6 inch plan (Sutherland, sheet LXXII) marked to show farm boundaries | [1944-1955] |
| RHP79415 | Ordnance Survey 6 inch plan (Sutherland, sheet LXXIII) marked to show farm boundaries | [1944-1955] |
| RHP79428 | Ordnance Survey 6 inch plan (Sutherland, sheet XCII) marked to show farm boundaries | [1944-1955] |
| RHP79429 | Ordnance Survey 6 inch plan (Sutherland, sheet XCIII) marked to show farm boundaries | [1944-1955] |
| RHP79435 | Ordnance Survey 6 inch plan (Sutherland, sheet C) marked to show farm boundary | [1944-1955] |
| RHP79436 | Ordnance Survey 6 inch plan (Sutherland, sheet CI) marked to show farm boundaries | [1944-1955] |
| RHP79437 | Ordnance Survey 6 inch plan (Sutherland, sheet CIII) annotated to indicate presence of Colorado Beetle in area | [1944-1955] |
| RHP79441 | Ordnance Survey 6 inch plan (Sutherland, sheet CVII) marked to show farm boundaries | [1944-1955] |
| RHP79442 | Ordnance Survey 6 inch plan (Sutherland, sheet CIX) marked to show farm boundaries | [1944-1955] |
| RHP79444 | Ordnance Survey 6 inch plan (Sutherland, sheet CXI; Ross and Cromarty, parts of sheets XVIII, XVIIIA, XXVI & XXVII) annotated to indicate presence of Colorado Beetle in area | [1944-1955] |
| RHP79445 | Ordnance Survey 6 inch plan (Sutherland, sheet CXII) marked to show farm boundaries | [1944-1955] |
| RHP81807 | Plan of part of estate of Ospisdale showing marches | Nov 1811 |
| RHP85393 | Plan and elevation of bridge to be erected over River Shin | 8 Mar 1822 |
| RHP85621 | Plan of estate of Glencassley, Creich, Sutherland | 1870 |
| RHP92546 | Copy plan of controverted marches and grazings at Duchally (Douchally) in dispute between Lord Reay and Roderick McLeod of Cadboll | 1766 |
| RHP92547 | Plan of controverted ground at Duchally between Lord Reay and Roderick McLeod of Cadboll, with note added about existence of field book showing how plan was compiled | Jul 1765 |
| RHP92699 | Plan of ground between Lochs Migdale, Buidhe and Laro, Creich, Sutherland | 1815 |
| RHP92700 | Plan of ground between Lochs Migdale, Buidhe and Laro, Creich, Sutherland | [1815] |
| RHP97748 | Ordnance Survey 6 inch plan (Sutherland, sheet CI) marked to show classification of land | [1944-1954] |
| RHP97750 | Ordnance Survey 6 inch plan (Sutherland, sheet CXI) marked to show classification of land | [1944-1954] |
| RHP97781 | Ordnance Survey 6 inch plan (Sutherland, sheet CI) marked to show position of telegraph poles, stays and struts between Rosehall and Oykel Bridge | [c 1908] |
| RHP124418 | Hand coloured drawing showing elevation and plan of Oykel Viaduct, Invershin (Highland Railway) | 1912 |
| RHP124419 | Paper Print showing elevation, plan and sections for strengthening of floor of Oykel Viaduct, Invershin. (London Midland & Scottish Railway) | 1923-1947 |
| RHP129764 | Drawing showing elevation, plan and sections of Oykel Viaduct between Culrain and Invershin (Sutherland Railway) | c 1865 |
| RHP141321 | Plans of Kyle of Sutherland and estuary of River Carron | Jun 1898 |
| RHP141321/1 | Plan of Kyle of Sutherland and estuary of River Carron | Jun 1898 |
| RHP141321/2 | Sections of fishing stations, hailing places and bulwarks on the Carron and Kyle | Jun 1898 |
| RHP141321/3 | Sections of fishing stations, hailing places and bulwarks on the Carron and Kyle | Jun 1898 |
| RHP141321/4 | Sections of fishing stations, hailing places and bulwarks on the Carron and Kyle | Jun 1898 |
| RHP143000/3/15 | Ordnance Survey 1 inch map (Sheet 102, [Lairg]) | 1881 |
| RHP143400/4/2 | Ordnance Survey 6 inch plan, Sutherland, Sheet NC 40 NW | 1970s-1980s |
| RHP143400/8/15 | Ordnance Survey 6 inch plan, Ross and Cromarty; Sutherland, Sheet NH 59 NE | 1960s-1970s |
| RHP143400/8/29 | Ordnance Survey 6 inch plan, Ross and Cromarty; Sutherland, Sheet NH 78 NW | 1960s-1970s |
| RHP143400/8/33 | Ordnance Survey 6 inch plan, Sutherland, Sheet NH 79 SW | 1960s-1970s |