I forgot to add that in the 18th century Irish tunes can be found in several English works, especialy country dance collections. Scots works with Irish tunes are Oswald's 'Caledonian Pocket Comanion', Maclean's 'Scots Tunes', McGlashan's 'Scots Measures', 'The Scots Musical Museum' Aird's 'A Selection of Scots, English, Irish, and Foreign Airs', Brysson's 'Curious Collection'(mostly ~50 Irish tunes) and the Gows' 'Repository' and 'Strathspey Reels' series. These are besides works that are exclusively Irish tunes.