All the details were noted down. Then the value of each individual farm and farm building was calculated. The great corpus of work that was produced by the valuers is officially known as the 'Primary Valuation of Tenements'. However, it is generally referred to as 'Griffith's valuation', in honour of the man who supervised the mammoth task, Sir Richard Griffith. Griffith's valuation was published in book form by the government and full sets may be found in the National Library of Ireland and in the National Archives.
Sets relating to individual counties are usually to be found in the relevant county library.
Those who held land in more than one townland are listed in each townland in which they held land. The townlands are arranged alphabetically within their civil parish, the civil parishes being similarly arranged within their barony. The baronies are arranged by county. The pages of Griffith's valuation are set out in tabular form. In addition to the column of occupiers' names, there are columns which give details of the property held.