A friend of mine gave me this book recently. I'm still trying to get through the first chapter on centralization. I have to admit, I feel as though I'm not following him. A bunch of these games are puzzling in the sense that he speaks of centralization or the lack thereof, and I just don't see it. He often states a position is this or that as fact, but never really explains why?? I'm on the verge of just putting it down. 
BTW you can see these games and most of the annotations in algebriac on chessgames.com
I purchased Nimzovitch's 'Chess Praxis' in 1963 for $2.00. The section
on blockading quickly puzzled me. I couldn't make any sense of it. One
game ended in a draw, yet Nimozvitch claimed the blockade had triumphed.
I soon gave up on the book. About twelve years later I attempted again
to understand the blockade. It made a little more sense but much of it
still puzzled me. The following game occurred after studying John Cox's
'The Berlin Wall'. One of the major Black ideas is establishing a light
squared blockade and playing through the games reminded me of the ideas
in 'Chess Praxis' I would like to take another stab at Chess Praxis, but
I think it would costs more than $2.00 now.