The book covers a lot of language usage and nearly all grammar points. However, It is rife with misspelt Russian words which is 'unforgivable' when the item in question is a foreign grammar book, isn't it? The case would change dramatically if the misspelt words were the English words but they're not.
It is, nevertheless, one of the best grammar books available, not to say the most complete.
Somebody, please, let the authors know!