How much do you think this book is worth?

I was given a book from my grandfather called "Soldiers of the American Army 1775- 1941. It is in very good condition, only 500 were printed. It is hardback. But on one of the front page it says "To Franklin Delano Roosevelt From his old time friend Homer mings Christmas 1944". I looked up the signature online and it is exact and does look written not printed. Where should I go to get this book appraised? Do you think it is actually worth anything? Thank you!!!!