Romania, An Illustrated History by Nicolae Klepper. 2002, ISBN 978-0-7818-0935-1.
This book provides a concise history of the area now known as Romania from pre-history to just after 2000. For me the most interesting parts were the early chapters (1-7) that covered the ancient and medieval history. From the book it seems clear that Romania has had a long history of struggling with more powerful neighbors from the Greeks and Romans to the Ottomans and the Austro-Hungarians and Russians.
Purchased at Powells books, 6-3-2012, 16.95.

The Pythagorean Theorem by Alfred S. Posamentier.  2010, ISBN 978-1-61614-181-3. Subtitled: The Story of Its Power and Beauty.
The cover shows a "Pythagorean Tree" constructed from layers of Pythagorean triangles with squares on their sides. (Discussed in chapter 7.) This book is similar to the book by Eli Maor, but covers topics not discussed in that other book. Both books are worth reading.
Purchased from amazon.com, 10-5-2010, for $19.71.