All.
I really enjoy his book on 1812. Specially the campaign overview which is simply great! Maximum of info with a needed minimum of words. A bit overly simplistic as any generalisation, but very good to understand the course of campaign.
The book about 1799 seemed a bit one sided to me and not detailed enough. But after Milyutin's fundamental work anything else will seem modest.
I was a disappointed with book on 1806. For me it didn't provide the explanation of the course of the campaign I expected to receive like in the one on 1812. Maybe I was not concentrated enough though.
His general book on the Principles of War is placed on the website of the Club. Here you can find a link to this book as well as Sun Tsu and Jomini http://www.wargame.ch/wc/nwc/Links.htm
To repeat. All of the books are definately worth reading. And worth buying if it came to that.
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<center><b>Eyo Imperatorskogo Velichestva Leib-Kirassirskogo polku
General-Adjutant Anton Valeryevich Kosyanenko
Commander of the Second Army of the West </b></center>