Classification
320 - Political science
330 - Economics
333 - Economics of land & energy
7
363 - Other social problems & services
600 - Technology
630 - Agriculture & related technologies
620 - Engineering & allied operations
6
000 - Computer science, information & general works
4
551 - Geology, hydrology & meteorology
4
700 - The arts; fine & decorative arts
3
300 - Social sciences
2
370 - Education
2
580 - Plants (Botany)
2
100 - Philosophy & psychology
1
140 - Specific philosophical schools
1
304 - Factors affecting social behavior
1
350 - Public administration & military science
1
581 - Specific topics in natural history
1
610 - Medicine & health
1
657 - Accounting
1
720 - Architecture
1