Classification
300 - Social sciences
6
363 - Other social problems & services
600 - Technology
6
900 - History & geography
100 - Philosophy & psychology
5
340 - Law
5
000 - Computer science, information & general works
4
320 - Political science
4
370 - Education
4
620 - Engineering & allied operations
4
200 - Religion
3
120 - Epistemology, causation & humankind
2
170 - Ethics
2
330 - Economics
2
400 - Language
2
301 - Sociology & anthropology
1
333 - Economics of land & energy
1
380 - Commerce, communications & transportation
1
720 - Architecture
1