Classification
100 - Philosophy & psychology
370 - Education
600 - Technology
900 - History & geography
300 - Social sciences
12
620 - Engineering & allied operations
10
330 - Economics
8
610 - Medicine & health
8
320 - Political science
7
700 - The arts; fine & decorative arts
7
333 - Economics of land & energy
5
140 - Specific philosophical schools
4
301 - Sociology & anthropology
4
780 - Music
4
340 - Law
3
380 - Commerce, communications & transportation
3
400 - Language
3
500 - Natural sciences & mathematics
3
576 - Genetics & evolution
3
000 - Computer science, information & general works
2
170 - Ethics
2
363 - Other social problems & services
2
410 - Linguistics
2
530 - Physics
2
540 - Chemistry & allied sciences
2
630 - Agriculture & related technologies
2
658 - General management
2
304 - Factors affecting social behavior
1
720 - Architecture
1
800 - Literature & rhetoric
1