Classification systems by subject - Subtopics

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