Classification
160 - Logic
300 - Social sciences
900 - History & geography
330 - Economics
2
700 - The arts; fine & decorative arts
2
100 - Philosophy & psychology
1
120 - Epistemology, causation & humankind
1
170 - Ethics
1
320 - Political science
1
500 - Natural sciences & mathematics
1
530 - Physics
1
600 - Technology
1