Classification
301 - Sociology & anthropology
500 - Natural sciences & mathematics
900 - History & geography
3
100 - Philosophy & psychology
2
300 - Social sciences
2
000 - Computer science, information & general works
1
120 - Epistemology, causation & humankind
1
140 - Specific philosophical schools
1
170 - Ethics
1
330 - Economics
1
363 - Other social problems & services
1
581 - Specific topics in natural history
1
600 - Technology
1
800 - Literature & rhetoric
1