Although it has what can only be described as a scientific approach to keeping tortoises and turtles, the book repeats itself on many of the issues surrounding conditions and time in hibernation etc. For example, as a marignated tortoise keeper I expected more than 1 page in the 257 page book (excluding glossary and references etc). Within these 257 pages, there are many references to many different types of turtle and tortoise, but only very breifly. As a result, it seems the author has tried to fit such a substatial topic into too small a book, and this detracts from the overall appeal. It is an encyclopedia, however a book for turtle keepers and a book for tortoise keepers would have been far better, as the author could have gone more in-depth with each specie. I am saying this as I don't particularly have the same feelings towards turtles as I do tortoises with regards character etc., and I would never consider having a turtle as a pet.
Gives excellent practical advice on general health problems and questions you have regarding hibernation, food, substrate etc if you are in doubt for every specie.
Overall, an excellent book if you want to get clued up on chelonia. If you are wanting more in-depth information for your specie or its family, look elsewhere.