General
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Classics (moderate number) () – Cooking (moderate number, after longish intro) – Critical theory (moderate number) – Dance (moderate number) – Entertainment (moderate number) – Film (long – 14 screens) – Gaming (moderate number, in Section 5) – Hobbies (long – 14 screens) – Literature (moderate number) – Music (moderate number) – Opera (red link) – Painting (moderate number) – Sculpture (small number) – Sports (moderate number) – Theater (smallish number) – Tourism (main topic) (not a list) – Visual arts (red link)
Counties (moderate number) – Countries (moderate number) – Countries (includes list of country lists) (This is the main list; also includes a smallish number of others.) – Lakes (smallish number) – Mountains (smallish number) – Rivers (small – just 6)
Mathematics (smallish) – Statistics (smallish)
'Philosophy (longish) and Religion (very long)
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Thinking (smallish)
Astronomy (smallish) – Biochemistry (moderate number) – Biology (longish) – Chemistry (longish) – Earth sciences (moderate number) – Physics (smallish)
Anthropology (main topic) (not a list) – Archaeology (smallish) – Business (smallish) – Economics (small) – Education (very long) – Family and consumer science (main topic) (not a list; little there) – History of Science and Technology (not a list, not appropriate for topic tree) – Law (small) – Linguistics (smallish) – Parapsychology (very small, just 10) – Political science (smallish) – Psychology (moderate number) – Public affairs (small) – Sociology (very small, only about 5)
Agricultural science (moderate number) – Architecture (moderate number) – Communication (moderate number) – Computer science (small) – Engineering (small) – Health science (moderate number) – History of Science and Technology (na) – Library and information science (longish) – Technology (small) – Transportation (moderate number)