I have every book I can get hold of about the Duke and Duchess of Windsor.
I also have about 5 about King Charles II. About 8 Queen Victoria, 4 about Princess Diana and many many more.
I am a member of
www.librarything and I can recommend it to everyone who wants to keep their books in order, it does the statistics for you, keeps a tally of your favourite subjects and you can view your whole library on line. You can have up to 100 free and then for a small fee you can have as many as you want. I have listed about 300 of mine up to now but some members have about 5,000 books in their library.
I love it.