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