Classification
170 - Ethics
500 - Natural sciences & mathematics
100 - Philosophy & psychology
9
120 - Epistemology, causation & humankind
4
140 - Specific philosophical schools
4
530 - Physics
3
000 - Computer science, information & general works
2
300 - Social sciences
2
301 - Sociology & anthropology
2
320 - Political science
2
333 - Economics of land & energy
2
363 - Other social problems & services
2
581 - Specific topics in natural history
2
600 - Technology
2
700 - The arts; fine & decorative arts
2
900 - History & geography
2
153 - Mental processes & intelligence
1
158 - Applied psychology
1
160 - Logic
1
200 - Religion
1
330 - Economics
1
340 - Law
1
370 - Education
1
400 - Language
1
520 - Astronomy & allied sciences
1
551 - Geology, hydrology & meteorology
1
576 - Genetics & evolution
1
580 - Plants (Botany)
1
610 - Medicine & health
1