https://dspace01.hit.no/handle/2282/534 (Fig. 2 shows the distribution of beavers in Russia, Mongolia and Kazakhstan, 2003))

http://link.springer.com/chapter/10.1007/978-1-4615-4781-5_4 about beavers in Russia and adjoining countries (1999)

http://link.springer.com/article/10.1023/A:1020911800651 (about their natural movements in Russia, 2002)

Thank You for information. I needed this information. Best regards

Hi Denis, It's great that you sent me the paper. I'll have something to read, and I remember the Russian language :)

Thank You very much.

Best regards