Classification systems by subject - Subtopics

Employment classifications Classification of people Classes of computers Statistical classification Trade and industrial classification systems Medical classification Weight classes Educational classification systems Travel classes Music classification Language classification Geographic classifications Sailing by class Mathematical classification systems Soil classification Scientific classification Chemical classification Vehicle classification Character classes Windsurfing by class Sailing classes Classification of minerals Mass media awards by category Parasports classifications Pulitzer Prizes by category Patent classifications Sports league systems Astronomical classification systems Programming language classification Complexity classes Media content ratings systems Rail transport classification systems Classes of angels Wine classification Climate and weather classification systems