Classification systems by subject - Subtopics

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