1. Very fine, that you have a copy. I think I have much more of them but I am not a Harrach. I am only related to them. I you want, I could sell you some books of the Harrach-library with Harrach-Ex-Libri. Most of them of the 18th century!
2. Try to figure out, why they came to USA.
3. You won the first price because you are the one, who found "royal Harrachs" for the first time. I think a lot of historians will be real surprised.
4. If you need more Peters you could use Wikipedia. There is another Peter Harrach. And he is still living.
5. You need no help, you know everything. You are a real count - in the USA; like I am a Kennedy in Europe.