Hi Wicklowman,
There is a beautiful book by Derek Paine - Pictorial History of Kilcoole, Newcastle, Newtownmountkennedy, Glen O' the Downs and Delgany 1860-1985.
As far as I'm aware, this book is out of print! The copy I'm lucky enough to have access to was purchased in Greystones some years ago. The local book shop in Greystones didn't stock it up to a few months ago. Perhaps you could try the library in Greystones and see if they can help.
Is there any particular information your looking for about
these areas?
Wicklow way