Classification
100 - Philosophy & psychology
330 - Economics
600 - Technology
900 - History & geography
300 - Social sciences
12
320 - Political science
10
620 - Engineering & allied operations
10
700 - The arts; fine & decorative arts
9
370 - Education
8
780 - Music
6
610 - Medicine & health
5
380 - Commerce, communications & transportation
4
400 - Language
4
530 - Physics
4
140 - Specific philosophical schools
3
301 - Sociology & anthropology
3
333 - Economics of land & energy
3
340 - Law
3
410 - Linguistics
3
576 - Genetics & evolution
3
720 - Architecture
3
658 - General management
2
770 - Photography, photographs & computer art
2
170 - Ethics
1
200 - Religion
1
304 - Factors affecting social behavior
1
350 - Public administration & military science
1
363 - Other social problems & services
1
500 - Natural sciences & mathematics
1
540 - Chemistry & allied sciences
1
581 - Specific topics in natural history
1
630 - Agriculture & related technologies
1
800 - Literature & rhetoric
1