| RHP8733 | Plan of proposed harbour at Portmahomack, including elevation of pier (1-2) | 1793 |
| RHP13246 | Sketch plan of Rockfield Pier: 1891. | 1891 |
| RHP13247 | Sketch plan of Portmahomack Harbour: 1891. | 1891 |
| RHP30220 | Particulars of sale and plans (5) of estate of Cadboll (except the Invergordon portion). From Ordnance Survey | 1918 |
| RHP38280 | Photocopy of plan of the barony of Tarbat and Easter Aird, the property of Aeneas Macleod of Cadboll, including farms of Bindal, Hilton, Brucefield, Wilkhaven, Bindal Crofts, Lighthouse Lands, and Portmahomack, With table of contents. | 1854 |
| RHP79257 | Ordnance Survey 6 inch plan (Ross and Cromarty, sheet XXX) coloured and marked to show types of farming and farm boundaries | [1944-1955] |
| RHP79266 | Ordnance Survey 6 inch plan (Ross and Cromarty, sheet XLII) coloured and marked to show types of farming and farm boundaries | [1944-1955] |
| RHP79267 | Ordnance Survey 6 inch plan (Ross and Cromarty, sheet XLIII) coloured and marked to show types of farming and farm boundaries | [1944-1955] |
| RHP92852 | Ordnance Survey 1 inch map (Cromarty, sheet 94) | [1907] |
| RHP97671 | Ordnance Survey 6 inch plan (Ross and Cromarty, sheet XXX) coloured to show classification of land | [1944-1954] |
| RHP97674 | Ordnance Survey 6 inch plan (Ross and Cromarty, sheet XLII) coloured and marked to show classification of land | [1944-1954] |
| RHP97675 | Ordnance Survey 6 inch plan (Ross and Cromarty, sheet XLIII) coloured and marked to show classification of land | [1944-1954] |
| RHP143077 | Plan of part of road at Hilton Farm, Portmahomack | 1983 |
| RHP143400/8/41 | Ordnance Survey 6 inch plan, Ross and Cromarty, Sheet NH 87 NE | 1960s-1970s |
| RHP143400/8/43 | Ordnance Survey 6 inch plan, Ross and Cromarty, Sheet NH 88 SE | 1960s-1970s |
| RHP143400/8/54 | Ordnance Survey 6 inch plan, Ross and Cromarty, Sheet NH 98 SW | 1960s-1970s |