Classification
170 - Ethics
363 - Other social problems & services
330 - Economics
23
100 - Philosophy & psychology
21
140 - Specific philosophical schools
21
320 - Political science
20
333 - Economics of land & energy
18
610 - Medicine & health
18
700 - The arts; fine & decorative arts
18
600 - Technology
12
551 - Geology, hydrology & meteorology
11
340 - Law
10
900 - History & geography
10
300 - Social sciences
9
581 - Specific topics in natural history
8
620 - Engineering & allied operations
8
200 - Religion
6
370 - Education
6
000 - Computer science, information & general works
5
380 - Commerce, communications & transportation
5
800 - Literature & rhetoric
5
361 - Social problems & social welfare in general
4
630 - Agriculture & related technologies
4
580 - Plants (Botany)
3
720 - Architecture
3
500 - Natural sciences & mathematics
2
576 - Genetics & evolution
2
658 - General management
2
301 - Sociology & anthropology
1
302 - Social interaction
1
304 - Factors affecting social behavior
1
360 - Social problems & services; associations
1
400 - Language
1
530 - Physics
1
590 - Animals (Zoology)
1
612 - Human physiology
1
660 - Chemical engineering
1
780 - Music
1
791 - Public performances
1