I'll not make this sound like an advertisement, but this book is really great value for the money (thanks again to Dover). The book has 5 chapters, one by Golombeck (the translator) which is worth reading, but not much more. The rest are 4 perls by Kotov and Keres. This 4 chapters handle the topics: how to attack the king (depending on the pawn srtuctures and on the castles), how to play whit typical pawn structures (blocked center...) [both by Kotov]; how to defend actively in inferior positions, and how to do analysis (both by Keres, which was a fanatic correspondece player).