Classification
330 - Economics
320 - Political science
81
340 - Law
21
900 - History & geography
6
300 - Social sciences
5
576 - Genetics & evolution
5
600 - Technology
3
000 - Computer science, information & general works
2
333 - Economics of land & energy
2
363 - Other social problems & services
2
500 - Natural sciences & mathematics
2
700 - The arts; fine & decorative arts
2
160 - Logic
1
304 - Factors affecting social behavior
1
540 - Chemistry & allied sciences
1
580 - Plants (Botany)
1