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Rod’s Breeding Calculator
This great site can help you with breeding, but don’t overlook the excellent base calculator. This will help you work out what sort of time and resources are needed to get you from level a to level b.
Amoeba’s Dragon Breeding Calculator
Probably a little more refined than Rod’s breeding calculator. This place also has dragon stats, building stats and all sorts of useful information.
Powdered Toast Blog
This guy knows how to set things up just right. Whether it is attacking help or base defensive layout strategies, you can find a lot of useful tricks and tips here.