From the rear cover: Emperor's Vehicles has dozens of vehicles for land, air, and ocean adventuring. From the Introduction: The entries are divided into categories, each denoting an individual vehicle's capacity and function. User summary: Categories are a combination of one of the following "capacities" and one of the following "functions." Not all combinations are used. Capacities: Personal, Passenger, Carriages, Commercial, Industrial, Personnel, AFV, Gunship, Fighter, Bomber. Functions: Wheeled, Tracked, Grav, Winged, Rotary Winged, Water, Submersible, Close Orbit. Other categories not in combination: Beast of Burden, Destroyer, Rail, Dirigible.