Classification
900 - History & geography
55
700 - The arts; fine & decorative arts
14
301 - Sociology & anthropology
13
320 - Political science
11
140 - Specific philosophical schools
7
800 - Literature & rhetoric
6
100 - Philosophy & psychology
4
200 - Religion
3
410 - Linguistics
3
600 - Technology
3
340 - Law
2
370 - Education
2
551 - Geology, hydrology & meteorology
2
630 - Agriculture & related technologies
2
720 - Architecture
2
330 - Economics
1
333 - Economics of land & energy
1
363 - Other social problems & services
1
780 - Music
1