Part of Tŷ Coch Manuscripts
'A Survey of the Ancient and Present State of the County of Caernarvon by a Land surveyor [i.e. William Williams, Llandegai (1738-1817)], 1806', together with a list of the sheriffs of Caernarvonshire, 1540-1796.
A typescript copy of a report to the Caernarvonshire Rural Community Council of a survey of Caernarvonshire conducted by Mr. Robert Owen, O.B.E., M.A., Croesor, during the period 19 January to 22 June, 1934.
A survey of estates belonging to Richard Garnons, esq., in the parishes of Llanwnda, Llanfaglen [sic], Llanbeblig, Llandwrog, and Llanllyfni, Caernarvonshire, and of Llangadfan, Anglesey, 1813.
Surveys of the Gwysaney and Llannerch estates
Part of Gwysaney manuscripts