Classification systems by subject - Subtopics

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