Any information on 'RUSSIAN DONS' - the breed of horse?

My friend has just rescued a gorgeous horse - Josh - and all she knows is that his breed is 'Thoroughbred / Don'. The 'Don' refers to 'Russian Don'. I'd like to find out any information on this breed. Can anyone help - thanks, Bev
Answers:
http://en.wikipedia.org/wiki/russian_don...
http://www.ansi.okstate.edu/breeds/horse...
http://www.worldscreatures.com/land-spec...
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http://www.ansi.okstate.edu/breeds/horse...
http://www.horses.ru/don.htm
If you live in KY or near the Horse Park, I know they had a Russian Don (I haven't gone for a few years now though). My mom fell in love with him and wants a Russian Don, haha.
Awesome of your friend to rescue him!