"Great value of the 21st Sports century"
I have recently bought this book and i find it very useful and valuable. As i bought it for photography purposes, in order to understand the rules of the certain sports games, which i am going to photograph, this really is a magic wand. One can get familiar with almost all sports "games", that exist on our planet. Some will surprise you, as you might not even have a knowledge of such sports events existence.
The only improvement, that could be made, would be adding real photos from the events.