Classification
100 - Philosophy & psychology
600 - Technology
7
620 - Engineering & allied operations
610 - Medicine & health
5
700 - The arts; fine & decorative arts
5
333 - Economics of land & energy
4
363 - Other social problems & services
4
330 - Economics
3
630 - Agriculture & related technologies
3
900 - History & geography
3
140 - Specific philosophical schools
2
370 - Education
2
500 - Natural sciences & mathematics
2
657 - Accounting
2
720 - Architecture
2
170 - Ethics
1
200 - Religion
1
300 - Social sciences
1
301 - Sociology & anthropology
1
320 - Political science
1
380 - Commerce, communications & transportation
1
540 - Chemistry & allied sciences
1