Classification
500 - Natural sciences & mathematics
576 - Genetics & evolution
600 - Technology
620 - Engineering & allied operations
720 - Architecture
380 - Commerce, communications & transportation
4
700 - The arts; fine & decorative arts
4
900 - History & geography
4
140 - Specific philosophical schools
3
320 - Political science
3
340 - Law
3
363 - Other social problems & services
3
330 - Economics
2
100 - Philosophy & psychology
1
300 - Social sciences
1
333 - Economics of land & energy
1
370 - Education
1
530 - Physics
1
540 - Chemistry & allied sciences
1
658 - General management
1