This is another cool large-format book from Nagano's earlier career. I love his watercolor works and this book even contains one of the art pieces that I've been looking for since I got a poor copy in one of the english-translated volumes of the manga. This book primarily focuses on the Jagd Mirage (Twin Tower), with some other information on Ballance and others.
Twin Tower - Mamoru Nagano
This is a small letter/A4 calendar that mainly reuses art from the other artbooks.