Classification
320 - Political science
573
330 - Economics
573
300 - Social sciences
148
340 - Law
58
900 - History & geography
58
170 - Ethics
29
100 - Philosophy & psychology
26
630 - Agriculture & related technologies
16
200 - Religion
9
576 - Genetics & evolution
8
370 - Education
6
700 - The arts; fine & decorative arts
5
140 - Specific philosophical schools
4
800 - Literature & rhetoric
2
400 - Language
1
500 - Natural sciences & mathematics
1