Annie, the first thing I do is search Google books. Then I try WorldCatThere is a book, now out of print, that traces my family history back centuries. It's called the Stapletons of Drom. Do you have a resource for finding such books, long out of print?
Trying WorldCat I found 11 Libraries that have this book. Since I don't know where you live, you will need to go to WorldCat and type in your postal or zip code.
If you want to purchase a copy, Amazon has it
