Classification
400 - Language
600 - Technology
620 - Engineering & allied operations
700 - The arts; fine & decorative arts
5
500 - Natural sciences & mathematics
4
900 - History & geography
4
000 - Computer science, information & general works
3
140 - Specific philosophical schools
3
330 - Economics
3
363 - Other social problems & services
3
333 - Economics of land & energy
2
370 - Education
2
300 - Social sciences
1
340 - Law
1
380 - Commerce, communications & transportation
1
530 - Physics
1
540 - Chemistry & allied sciences
1
550 - Earth sciences
1
551 - Geology, hydrology & meteorology
1
658 - General management
1
720 - Architecture
1
780 - Music
1