aviation titles that don't fit into other specific categories
Putnam, Air Britain, Jane's AWA, Harborough/Harleyford, Squadron Signal, Profile Publications
Ian Allan "at War" series, Haynes Super Profiles, Blandford Pocket Encyclopaedia, Osprey Aircam, Airwar, Aircraft of the Aces etc.
Naval aviation, Seaplanes and Flying Boats
books which are character based, including biography, autobiography and other stories and histories of the worlds aviation people