Comprises: Item numbers: 25929-25957
- Cash book of William Dew as surveyor and auctioneer, and as proprietor of the British Hotel, Bangor, 1848-61
- Cash book recording sale transactions, 1859-64
- Bundle of correspondence between William Dew, William Bell (Parliamentary agent) and Colonel E.D.G. Pennant, relating to the Bangor and Llanberis railway, 1863-1871
- Papers relating to the Corris Railway and lands etc in counties Caernarfonshire, Meirioneth, Denbighshire, and Shropshire, 1864-9
- Recognizance entered into by William Dew regarding sale of land in Denbighshire, Flintshire and Montgomeryshire, 1868
- Inventory and valuation of property at Bryn y Neuadd, Llanfairfechan, Caernarfonshire, 1876-82
- Bundle of correspondence relating to Baron Hill wine sale, 1884
- Correspondence, stud book and other papers relating to Bangor Dog and Poultry Show, 1885
- Papers relating to proposed sale of Kinmel Estate, Denbighshire, 1890
- Particulars of freehold farms called Tan y Dinas and Ty Du, in the parish of Llanfihangel Dinsylwy, and Tan y Coed in the parish of Llaniestyn, to be sold by Lady Neave to Sir Richard H. Williams Bulkeley, including some correspondence, 1895
- Papers relating to a controversy between W. Horton, J.P. and Colwyn Bay District Council concerning sewers and sewerage proposals, 1902-4
- Photograph and papers relating to sale of Anglesey Castle, and Beaudesert orchestrion 1904-5
- Valuation of contents of Bodlondeb, near Bangor, 1906
- Particulars of farms in the parishes of Llanynghenedl, Llanllibio, Penmynydd, Llanddyfnan, Llandyfrydog, Bodwrog, Llanwenllwyfo, Llangwyllog, Llanfair-yng-Nghornwy and Llanrhuddlad, giving tenants' names, acreages and annual rents, no date
- Papers relating to sale of Hafod Las Quarry, Caernarfon, 1855-62
- Abstract of title of Nevin Granite Quarry Ltd to property on Nefyn Mountain with map attached, 1866
- Valuation of properties near Holyhead railway station relating to the London and North Western Railway Company, 1866
- Particulars relating to Treborth estate, 1867
- Material relating to exchange of lands in parishes of Llanfair Pwllgwyngyll and Llansadwrn, Anglesey in connection with the will of Henry William Paget, Marquess of Anglesey, 1870
- Report on the Ty'n y Fach slate property at Llanfihangel-y-Pennant, 1876
- Papers relating to the Colwyn Bay Water Company, 1878-9
- Transcript of examination by Welsh Land Commission, Llangefni sitting, 1893
- Account of labour and gardeners pay list relating to Plas Newydd Estate, 1897-9
- Account of expenditure by Anglesey County Council on Beaumaris Road, 1901
- Sale map of Royal Goat Hotel, Beddgelert, Caernarfonshire, 1903
- Notices to owners, lessees and occupiers relating to acquisition of land for the extension to North Wales Narrow Gauge Railway, 1903
- Notices to owners etc relating to acquisition of land for Porthmadog, Beddgelert and South Snowdon Railway, 1904
- Cash book relating to Anglesey Castle sale, 1904
- Bill book, general, 1904