Classification
900 - History & geography
60
320 - Political science
20
800 - Literature & rhetoric
15
350 - Public administration & military science
13
300 - Social sciences
11
301 - Sociology & anthropology
9
400 - Language
8
100 - Philosophy & psychology
6
410 - Linguistics
6
700 - The arts; fine & decorative arts
6
370 - Education
5
330 - Economics
4
610 - Medicine & health
3
780 - Music
3
170 - Ethics
2
304 - Factors affecting social behavior
2
363 - Other social problems & services
2
380 - Commerce, communications & transportation
2
500 - Natural sciences & mathematics
2
720 - Architecture
2
000 - Computer science, information & general works
1
140 - Specific philosophical schools
1
200 - Religion
1
333 - Economics of land & energy
1
340 - Law
1
576 - Genetics & evolution
1
580 - Plants (Botany)
1
581 - Specific topics in natural history
1
630 - Agriculture & related technologies
1