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All the 13 Irish 3000 footers are posted and many other hills as well. Everything above 2000 feet in the East, South and South West is posted plus some lower hills. Nothing in the West, North West, North or North East has yet been posted.
An excellent book to buy for those interested in the highest tops is "The Top 500 Summits" by Barry K. Smith. It covers the mountains in England, Ireland, Scotland and Wales. It should be available in any decent outdoor shop.