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