^ I'm the same way, I did that twice, 1. the Nicholas and Alexandra book by Massie, thinking that it be "more stuff" i was greatly disappointed. but kinda had too since the old one was in really bad shape. only difference that they printed less photos in the new one. so it was no biggie and i was working at the time.
2. when i got a second bio of Queen Marie of Romania, i was completely wrong. I gave old copy away. kinda glad since the old copy smelt of smoke (i HATE that)
I never saw the Greek Version of "Royal Hellenic Dynasty" it has the same cover as the English one, so i bid it the same.
Oh and i forgot i had these also in my collection:
17. The Wedding Number, the Illustrated London News , HRH Princess Marina December 1st, 1934
19. HRH the Duchess of Kent Anne Packard- 1950
20. A Romanov Diary- HRIH Grand Duchess George. Princess Maria of Greece- 1988 (Had this book under Russian Books)
21. The Kents Audrey Whiting 1985 (About Princess Marina and her family, under English Royal Books)
22. Marie Bonaparte, a Life- Celia Bertin - 1982 (had this book under French books)