I don't have access to a university library, but do have pretty good local reference librarians--would they be able to contact somebody at SIU and ask them to just look in the book to see if Skibbereen is in there? Or is there a way we could turn in a request that Google Books scan it?

On the cotamore thing, not sure what the problem is. One of the source singers, not sure if it was JW or another guy, said 'that's a big coat'. The quotation marks may have been the author's way of indicating dialect, a way of saying 'I'm spelling this with a th because that's the way these Irish guys pronounce their T's'.    But I can check my Gaelic dictionaries and see if some version of cotamore is in there.