| RHP3656 | Plan of improvements to Old Melrose, Berwickshire and Roxburghshire | 1809 |
| RHP5508 | Plan of the estate of Dryburgh and Holmes | 1839 |
| RHP22068 | Sketch plan of the lands of Mertoun, Whitrig, and Bemersyde | 16th century |
| RHP22069 | Sketch plan of the lands of Mertoun, Whitrig, and Bemersyde | 16th century |
| RHP22070 | Plan of the lands of Mertoun, Whitrig, and Bemersyde, Berwickshire | 16th century |
| RHP22072 | Sectional plan of proposed water-course from Whitrig Bog to Mertoun House | 1842 |
| RHP22073 | Sectional plan of proposed water course from Whitrig Bog Drift to Clint Mains | 1842 |
| RHP22082 | Plan of the estate of Dryburgh, the property of Captain George William Hutton Riddell of Muselee | Late 19th century |
| RHP22091 | Plan of Mertoun estate | 1922 |
| RHP22521 | Sketch plan of the lands of Mertoun showing march with lands belonging to Bemersyde | c 1675 |
| RHP22523 | Architectural plan of Mertoun church showing seating arrangements | Late 18th century |
| RHP22524 | Sketch plan of Whitrig Bog (Whiteridge Bogg) | Late 18th century |
| RHP22526 | Sectional plans of the grounds and intended drain at Whitrig near Mertoun | [Late 18th century] |
| RHP22527 | Sectional plans of the grounds and intended drain at Whitrig near Mertoun | Late 18th century |
| RHP22530 | Particulars of sale and plan of the estate of Mertoun, the property of the trust estate of Rt. Hon. Lord Polwarth | 1912 |
| RHP22563 | Plan of the old march between the lands of Newmains and the lands of Dryburgh, Mertoun, Berwickshire | 1812 |
| RHP40785 | Architectural plan of foundations of addition to Mertoun House showing drains. | 1843 |
| RHP40786 | Architectural plan of ground floor of Mertoun House, showing alterations and elevations of doors. | 1843 |
| RHP40787 | Architectural plan of principal floor of Mertoun House, showing alterations and detail of cornice. | 1843 |
| RHP40788 | Architectural plan of bedroom floor of Mertoun House, showing alterations. | 1843 |
| RHP40789 | Architectural plan of part of attic floor of original building of Mertoun House. | 1843 |
| RHP40790 | Architectural west elevation of addition to Mertoun House. | 1843 |
| RHP40791 | Architectural south elevation of addition to Mertoun House. | 1843 |
| RHP40792 | Architectural east elevation of addition to Mertoun House. | 1843 |
| RHP40793 | Architectural sections of addition to Mertoun House and plan of staircase ceiling. | 1843 |
| RHP40794 | Architectural plan of timbers and metal beams of principal and bedroom floors of addition to Mertoun House. | 1843 |
| RHP40795 | Architectural plan and section of roof of addition to Mertoun House. | 1843 |
| RHP40796 | Architectural plan and section of entresol and plan of part of bedroom floor at Mertoun House. | 1843 |
| RHP40797 | Architectural plan and section of new attic of Mertoun House. | 1843 |
| RHP40798 | Architectural elevation and section of new attic of Mertoun House. | 1843 |
| RHP40799 | Architectural plan and section of timbers and girders of new roof of Mertoun House. | 1843 |
| RHP40800 | Architectural plan of new roof of Mertoun House. | 1843 |
| RHP40801 | Architectural plan and section of attic and part of bedroom floors of Mertoun House. | 1843 |
| RHP40802 | Architectural plan and section of roof of existing house and addition at Mertoun House. | 1843 |
| RHP40803 | Architectural plan and section of ground floor of laundry and kitchen offices at Mertoun House, showing alterations. | 1843 |
| RHP40804 | Architectural elevation, section and plan of roof of laundry and kitchen offices at Mertoun House. | 1843 |
| RHP42252 | Plan of the estate of Dryburgh, the property of Captain G W H Riddell of Muselee. | [Late 19th century] |
| RHP77212 | Ordnance Survey 6 inch plan (Berwickshire, sheet XXX.NW) coloured and marked to show types of farming and farm boundaries | [1944-1954] |
| RHP77213 | Ordnance Survey 6 inch plan (Berwickshire, sheet XXX.NE; Roxburghshire, parts of sheets IV & VIII) coloured and marked to show types of farming and farm boundaries | [1944-1954] |
| RHP77214 | Ordnance Survey 6 inch plan (Berwickshire, sheet XXX.SW & SE; Roxburghshire, part of sheet VIII) coloured and marked to show types of farming and farm boundaries | [1944-1954] |
| RHP77215 | Ordnance Survey 6 inch plan (Berwickshire, sheet XXXI.NW; Roxburghshire, sheets IV, V, VIII & IX) coloured and marked to show types of farming and farm boundaries | [1944-1954] |
| RHP77248 | Ordnance Survey 6 inch plan (Berwickshire, sheet XXVI.SE; Roxburghshire, part of sheet IV) coloured and marked to show types of farming and farm boundaries | [1944-1954] |
| RHP79450 | Ordnance Survey 6 inch plan (Roxburghshire, sheet V; Berwickshire, parts of sheets XXVI, XXVII, XXX & XXXI) coloured and marked to show types of farming and farm boundaries | [1944-1955] |
| RHP79454 | Ordnance Survey 6 inch plan (Roxburghshire, sheet IX; Berwickshire, parts of sheets XXX, XXXI & XXXII) coloured and marked to show types of farming and farm boundaries | [1944-1955] |
| RHP93486 | Plan of proposed housing development between St Boswells and Newtown St Boswells | [c 1900] |
| RHP95786 | Ordnance Survey 6 inch plan (Berwickshire, sheet XXVI.SE; Roxburghshire, part of sheet IV) coloured and marked to show classification of land | [1944-1955] |
| RHP97687 | Ordnance Survey 6 inch plan (Roxburghshire, sheet VIII; Berwickshire, part of sheet XXX; Selkirkshire, parts of sheets VIII & XII) coloured to show classification of land | [1944-1954] |