8 books • 2 series
The Spitfire
British, French and Allied Aviation of WWI (Aviation Pioneers S.)
German and Austrian Aviation of World War 1 (Aviation Pioneers S., #3)
The Racing and Record-setting Aircraft (Aviation Pioneers S., #2)
X-planes (Aviation Pioneers S., #1)
Observers Warships
Nimitz Class - Super Carrier (How They Work)
Encyclopaedia of World Aircraft