Classification
000 - Computer science, information & general works
5
333 - Economics of land & energy
5
600 - Technology
5
620 - Engineering & allied operations
5
630 - Agriculture & related technologies
5
363 - Other social problems & services
4
330 - Economics
3
380 - Commerce, communications & transportation
3
610 - Medicine & health
3
700 - The arts; fine & decorative arts
3
140 - Specific philosophical schools
2
551 - Geology, hydrology & meteorology
2
580 - Plants (Botany)
2
658 - General management
1