| RHP2922 | Plan and sections of the lands of Maryburgh, Brekanord, Lower Kildun and Island-More, part of the estate of Brahan, showing land reclaimed along the River Conon | 1852 |
| RHP3084 | Plan of the lands of Maryburgh etc, part of the estate of Brahan, Dingwall, Ross and Cromarty | 1852 |
| RHP3093 | Plans (Ordnance Survey) marked to show parts of estate of Drummondreach, Urquhart and Logie Wester, Ross and Cromarty | nd |
| RHP3094/1 | Plans of land near Alcaig to be taken for the Cromarty and Dingwall Light Railway | 1914 |
| RHP3094/3 | Plan and section of land between Corntown and Ferintosh Glebe to be taken for the Cromarty and Dingwall Light Railway | 1908 |
| RHP3094/5 | Plan of land near Alcaig to be taken for the Cromarty and Dingwall Light Railway | 1915 |
| RHP3097/1-2 | Ordnance Survey 1/2500 plan (Ross-shire & Nairnshire, LXXXVIII.4 - 2 copies) of area from Dingwall Harbour to Drummondreach | 1876 |
| RHP3098/1-3 | Architectural plans of alterations to Dunvornie and Teanahinch farm steadings of Culloden Estate | 1900 |
| RHP3108 | Plans of the estate of Ferintosh, Ross and Cromarty | 1899 |
| RHP3513 | Plan of the estate and barony of Findon the property of Sir Roderick Mackenzie of Scatwell. | 1769 |
| RHP3549 | Plan of the lands of Findon, Ross and Cromarty | 1837 |
| RHP3680 | Plan of the estate of Findon, reduced in 1853. | 1849 |
| RHP10545 | Plan of River Conon, Cononbridge and Dingwall | 1832 |
| RHP10546 | Plan of River Conon, Cononbridge and Dingwall | 1832 |
| RHP11661 | Plan of proposed road from the Point of Fortrose to the junction with the Beauly Road near Conon Bridge. | 1814 |
| RHP11750 | Section of Ordnance Survey 6 inch plan marked to show proposed routes of the Dingwall and Cromarty Light Railway. | 20 Jun 1898 |
| RHP12645 | Architectural plan of toll-house at Cononbridge | 1828 |
| RHP17426 | Elevation of footbridge at Conon Station (London Midland and Scottish Railway). | 1924 |
| RHP17882 | Bound plans and sections for Cromarty and Dingwall Light Railway | Nov 1896 |
| RHP18087 | Bound plans and sections of the Cromarty and Dingwall Light Railway, including deviation of said railway at Jemimaville. | 1896, 1899, 1906. |
| RHP23893 | Ordnance Survey 6 inch plan marked to show pipelines near Rootfield croft. | 1907 |
| RHP40937 | Architectural elevations of Mission Church, Conon. | 10 January 1906 |
| RHP40938 | Architectural plan and elevation of steading, Ferintosh. | 1891 |
| RHP40939 | Architectural plans and cross section of Free Church of Urquhart-Gerintosh, with specification of heating system. | 12 March 1909 |
| RHP40940 | Ordnance Survey 1/2500 plan (Ross and Cromarty, sheet LXXXVIII.4) marked to show Urquhart Glebe in Presbytery of Dingwall. | 26 May 1926 |
| RHP40941 | Ordnance Survey 1/2500 plan (Ross and Cromarty, sheet LXXXVIII.16), marked to show Mulbuie Glebe in Presbytery of Dingwall. | 26 May 1926 |
| RHP43265 | Plan of proposed bridge at Cononbridge and bridge over the Orrin at Aultgowrie, Ross and Cromarty | 1801 |
| RHP44261 | Plan of part of River Conon near Dingwall, marked to show disputed fishings and land belonging to Ferintosh and Seaforth estates. (Damaged) | Late 19th century |
| RHP44262 | Plan of fishings and tidal levels along part of River Conon between Conon and Dingwall. and marked to show dividing line thereto from Ryefield House. | 1832,1868 |
| RHP44263 | Plan of part of River Conon above [Dingwall], showing land proposed to be given to Seaforth estate. | 1878 |
| RHP44264 | Ordnance Survey 1/2500 plan (Ross-shire, sheet LXXXVIII.7) marked to show old channel of part of River Conon above [Dingwall]. | 1878 |
| RHP44265 | Ordnance Survey 1/2500 plan (Ross-shire, sheet LXXXVIII.7) marked along part of River Conon near Maryburgh to show boundary between estates of Ferintosh and Seafield. | 1876 |
| RHP44267 | Ordnance Survey 6 inch plan (Ross and Cromarty, sheet LXXXIX) marked round Bogbuie to show estate of Ferintosh and proposed bounds of afforestation. | 1910 |
| RHP44268 | Ordnance Survey 6 inch plan (Ross and Cromarty, sheet LXXXVIII) marked round Knocknafanaig to show [estate of Ferintosh and proposed bounds of afforestation]. | 1910 |
| RHP44269 | Ordnance Survey 6 inch plan (Ross-shire, sheet LXXXVIII) marked to show proposed extension of Cromarty and Dingwall Light Railway from Conon Station to Urquhart. | 1897 |
| RHP44270 | Sections of proposed diversion of Cromarty and Dingwall Light Railway through Ryefield. | 1897 |
| RHP44271 | Ordnance Survey 1/2500 plan (Nairnshire, sheet LXXXVIII.8) marked to show use of farmland near Ryefield. | 1873 |
| RHP78849 | Ordnance Survey 6 inch plan (Ross and Cromarty, sheet LXXXIX.SW) marked to show farm boundaries | [1944-1955] |
| RHP78863 | Ordnance Survey 6 inch plan (Ross and Cromarty, sheet LXXXIX.NW) marked to show farm boundaries | [1944-1955] |
| RHP79293 | Ordnance Survey 6 inch plan (Ross and Cromarty, sheet LXXVII) marked to show farm boundaries | [1944-1955] |
| RHP79302 | Ordnance Survey 6 inch plan (Ross and Cromarty, sheet LXXXVIII) marked to show farm boundaries | [1944-1955] |
| RHP79312 | Ordnance Survey 6 inch plan (Ross and Cromarty, sheet XCIX) marked to show farm boundaries | [1944-1955] |
| RHP122334 | Hand coloured drawing showing plan of proposed improvements to level crossing at Craig Road, Dingwall. (London Midland & Scottish Railway) | 1939 |
| RHP122335 | Drawing showing plan of proposed improvements to level crossing at Strathpeffer Road, Dingwall. (London Midland & Scottish Railway) | 1938 |
| RHP128569 | Drawing showing elevation of Bridge No 42 carrying Occupation Road over railway near Conon (London Midland and Scottish Railway) | 1924 |
| RHP130748 | Elevations looking North at Public Road Bridge No39 over railway between Muir of Ord and Canon (London Midland and Scottish Railway) | Feb 1924 |
| RHP142805 | Plan of Brahan estate, Ross and Cromarty | 1852 |
| RHP142809 | Ordnance Survey 1/2500 plans (Cromartyshire and Nairnshire) | c1892 |
| RHP143400/8/7 | Ordnance Survey 6 inch plan, Ross and Cromarty, Sheet NH 55 NW | 1960s-1970s |
| RHP143400/8/8 | Ordnance Survey 6 inch plan, Ross and Cromarty, Sheet NH 55 NE | 1960s-1970s |
| RHP143400/8/9 | Ordnance Survey 6 inch plan, Ross and Cromarty, Sheet NH 55 SE | 1960s-1970s |
| RHP143400/8/10 | Ordnance Survey 6 inch plan, Ross and Cromarty, Sheet NH 55 SW | 1960s-1970s |
| RHP143400/8/13 | Ordnance Survey 6 inch plan, Ross and Cromarty, Sheet NH 56 SE | 1960s-1970s |
| RHP143400/8/17 | Ordnance Survey 6 inch plan, Ross and Cromarty, Sheet NH 65 NW | 1960s-1970s |
| RHP143400/8/23 | Ordnance Survey 6 inch plan, Ross and Cromarty, Sheet NH 66 SW | 1960s-1970s |