Classification
320 - Political science
333 - Economics of land & energy
3
363 - Other social problems & services
3
600 - Technology
3
620 - Engineering & allied operations
630 - Agriculture & related technologies
100 - Philosophy & psychology
2
330 - Economics
2
610 - Medicine & health
2
700 - The arts; fine & decorative arts
2
000 - Computer science, information & general works
1
370 - Education
1
551 - Geology, hydrology & meteorology
1
580 - Plants (Botany)
1
581 - Specific topics in natural history
1
657 - Accounting
1
900 - History & geography
1