Thought I'd let interested travelers know that Eyewitness Travel's Eastern & Central Europe covers all five countries we will visit on our river cruise from Eastern Europe to the Black Sea. The book is 671 pages long and has great diagrams, lots of photos of various sizes, and plenty of information about the history of sites we'll visit. You can google their site, click on the book, and actually see the table of contents as well as pages throughout the book. Enjoy!!