This famous ( at least in india) problem book by a Soviet author is available here
http://mirtitles.org/2011/12/05/science ... n-physics/
the direct download link is
http://ifile.it/g6fpt8w
This website maintained by some indian , has tons of other books published by various Soviet publishers like Mir, Raduga etc.
on science...
Amazing collection.......
So go fast and download it all ............