| RHP75 | Plan of the lands of Duncansby including Stemster, Canisbay, Caithness | 1817 |
| RHP75/1 | Plan of the lands of Duncansby including Stemster, Canisbay, Caithness | Sep 1817 |
| RHP75/2 | Plan of the lands of Duncansby including Stemster, Canisbay, Caithness | 1817 |
| RHP75/3 | Plan of the lands of Duncansby including Stemster, Canisbay, Caithness | 1817 |
| RHP873 | Book of plans of Island of Stroma, Caithness | c 1812 |
| RHP873/1 | Plan of part of Island of Stroma, Caithness | c 1812 |
| RHP873/2 | Plan of part of Island of Stroma, Caithness | c 1812 |
| RHP873/3 | Plan of part of Island of Stroma, Caithness | c 1812 |
| RHP873/4 | Plan of part of Island of Stroma, Caithness | c 1812 |
| RHP873/5 | Plan of part of Island of Stroma, Caithness | c 1812 |
| RHP873/6 | Plan of part of Island of Stroma, Caithness | c 1812 |
| RHP5236 | 1. Ordnance Survey 1 inch map (sheet 116), marked to show new boat pier at Duncansby.
2. Plan of the boat pier | 1892 |
| RHP5466 | 1-2. Ordnance Survey 1/2500 plan (Caithness, III.5 - 2 copies) marked to show Stroma harbour.
3. Bound plans and section of work proposed at Stroma harbour. | 1953 |
| RHP5466/1 | Ordnance Survey 1/2500 plan (Caithness, III.5) marked to show Stroma harbour. | 1953 |
| RHP5466/2 | Bound plans and section of work proposed at Stroma harbour | 1953 |
| RHP6077 | Plan of the island of Stroma | [1811] |
| RHP11612 | Plan of intended road from Huna (Houna) Inn to the town of Thurso. | 1798 |
| RHP22354 | Sketch plan of ground laid off at Freswick for the accommodation of the coastguard stationed there | 1828 |
| RHP22358 | Architectural plan of ground, mid and attic floors of [?Freswick House]. | 1814 |
| RHP22359 | Architectural plan of ground floor of [?Freswick House] | 1814 |
| RHP22513 | Sketch plan of lands belonging to Earl of Caithness, Freswick and Brabster in area of Christian Hill (Hill of Kerson) and Warth (Wart) Hill | Late 19th century |
| RHP22514 | Architectural plans of ground and upper floors and front elevation of Barrogill Cottage | Late 19th century |
| RHP22517 | Architectural plan and elevation of proposed dwelling house and office houses at the Kirkstyle of Canisbay | Late 19th century |
| RHP22518 | Architectural plan and elevation of proposed farm office at Tresdale (Treasdale) steading. (Estimate written thereon). | Late 19th century |
| RHP34164 | Admiralty chart of Pentland Firth. | 1901 |
| RHP43418 | Plan, elevation and sections of pier at Gills Haven. | 1903 |
| RHP43579 | Plan of division of Canisbay Commonty. | 1847 |
| RHP43603 | Ordnance Survey 1/2500 plan (Caithness sheet III.5) (order and letter attached), marked to show Stroma Harbour limits. | 1953 |
| RHP43665 | Ordnance Survey 1/2500 plan marked to show landholding and proposed line of march near Gill Burn. | 1895 |
| RHP43666 | Ordnance Survey 1/2500 plan (Caithness sheet XIV.1) marked to show landholdings and acreage of arable land, pasture and woodland at Auckingill. | 1902 |
| RHP78984 | Ordnance Survey 6 inch plan (Caithness, sheet XIII) marked to show farm boundaries | [1944-1955] |
| RHP78985 | Ordnance Survey 6 inch plan (Caithness, sheet XIV) marked to show farm boundaries | [1944-1955] |
| RHP79521 | Ordnance Survey 6 inch plan (Caithness, sheets IIA & II) marked to show farm boundaries: [1944 x 1954] | nd |
| RHP79522 | Ordnance Survey 6 inch plan (Caithness, sheet IIIA & III) 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 |
| RHP79527 | Ordnance Survey 6 inch plan (Caithness, sheet VIII) marked to show farm boundaries: [1944 x 1954] | nd |
| RHP93953/62 | General plan and sections of Stroma Harbour (revised scheme no.1) | 5 Oct 1948 |
| RHP97557 | Ordnance Survey 6 inch plan (Caithness, sheets IIA & II) coloured and marked to show classification of land | [1944-1954] |
| RHP97558 | Ordnance Survey 6 inch plan (Caithness, sheets IIIA & III) coloured to show classification of land | [1944-1954] |
| RHP142367 | Plan of proposed extension of Canisbay burial ground, Caithness | [1963] |