RUSSIAN BLUE INFORMATION

Additional information about the defining characteristics
of this breed may be found at
The Cat Fanciers'Association site

Profile of the Russian Blue

History of the Russian Blue

Russian Blue Breed Standard 

A comparison of the blue cat breeds: the Russian Blue,
the British Shorthair (blue), the Chartreux, and the Korat is here

The facts behind that "Russian Blue Rescue Mix" - article here