Classification systems by subject - Subtopics

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