In addition, another book by Istvan Toperczer, published about the same time, in France, but in English.
http://artipresse.com/?p=1340&lang=fr
Email ArtiPresse for the price including postage. I paid for my copy with PayPal.
Both books have lists of claims and losses. I have not attempted to match the two lists, but I think there are differences. The Schiffer book concentrates on the NV aces, and their victories and losses. The ArtiPress book is an overview of the entire NV air war. I would recommend both books, which were published last year.
Enjoy!
Frank.