Classification
333 - Economics of land & energy
581 - Specific topics in natural history
600 - Technology
363 - Other social problems & services
9
330 - Economics
7
620 - Engineering & allied operations
6
551 - Geology, hydrology & meteorology
4
320 - Political science
3
140 - Specific philosophical schools
2
580 - Plants (Botany)
2
630 - Agriculture & related technologies
2
340 - Law
1
540 - Chemistry & allied sciences
1
610 - Medicine & health
1
658 - General management
1
700 - The arts; fine & decorative arts
1