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Dona,
If you have brought up a particular townland on Griffiths, click on “occupants”. When the list of occupants comes up, click on ”details”. You will see a section with “printing date” which tells you what year it was compiled.
Griffiths clerks started work in the southern counties of Ireland in 1848 and worked north over the next 16 years finishing in Co Antrim about 1864.
The Valuation Revision books take the initial valuation forward. So if your ancestor was in Griffiths in a particular year you can search forward to see when they were deleted and who replaced them, right up to 1929 (and beyond in some cases). The Revision records for the counties of Northern Ireland are on-line on the PRONI site. Those for the Republic of Ireland are not on-line yet and are held by the Valuation Office in Dublin.
