Classification
140 - Specific philosophical schools
330 - Economics
630 - Agriculture & related technologies
600 - Technology
7
000 - Computer science, information & general works
6
333 - Economics of land & energy
5
620 - Engineering & allied operations
5
700 - The arts; fine & decorative arts
5
363 - Other social problems & services
4
610 - Medicine & health
3
658 - General management
3
380 - Commerce, communications & transportation
2
540 - Chemistry & allied sciences
2
551 - Geology, hydrology & meteorology
2
581 - Specific topics in natural history
2
900 - History & geography
2
320 - Political science
1
340 - Law
1
350 - Public administration & military science
1
400 - Language
1
580 - Plants (Botany)
1
612 - Human physiology
1