Classification
100 - Philosophy & psychology
320 - Political science
330 - Economics
900 - History & geography
300 - Social sciences
24
340 - Law
11
600 - Technology
10
576 - Genetics & evolution
9
370 - Education
8
140 - Specific philosophical schools
7
700 - The arts; fine & decorative arts
6
780 - Music
6
301 - Sociology & anthropology
5
400 - Language
5
620 - Engineering & allied operations
5
170 - Ethics
4
333 - Economics of land & energy
4
380 - Commerce, communications & transportation
4
200 - Religion
3
410 - Linguistics
3
530 - Physics
3
770 - Photography, photographs & computer art
3
304 - Factors affecting social behavior
2
363 - Other social problems & services
2
581 - Specific topics in natural history
2
610 - Medicine & health
2
630 - Agriculture & related technologies
2
658 - General management
2
720 - Architecture
2
800 - Literature & rhetoric
2
350 - Public administration & military science
1
500 - Natural sciences & mathematics
1
550 - Earth sciences
1
920 - Biography, genealogy & insignia
1