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