Academic SubjectsClassified

Agriculture: Agriculture by type (Wikipedia)

Anthropology: Anthropology (Wikipedia)

Archaeology: Subfields of Archaeology (Wikipedia)

Astronomy: Astronomical Subdisciplines (Wikipeida)

Biology: Branches of Biology (Wikipedia)

Chemistry: Outline of Chemistry (Wikipedia)

Geology: Subfields of Geology (Wikipedia)

History: Fields of History (Wikipedia)

Linguistics: Branches of Linguistics (Wikipedia)

Mathematics: Mathematics Subject Classification (MSC)  

Psychology:  Psychology Subfields (APA)

Sociology: Subfields of Sociology (Wikipedia)

Library Classifications Systems