Classification
000 - Computer science, information & general works
4
140 - Specific philosophical schools
320 - Political science
4
581 - Specific topics in natural history
610 - Medicine & health
700 - The arts; fine & decorative arts
4
330 - Economics
3
333 - Economics of land & energy
3
304 - Factors affecting social behavior
2
363 - Other social problems & services
2
630 - Agriculture & related technologies
2
380 - Commerce, communications & transportation
1
551 - Geology, hydrology & meteorology
1
576 - Genetics & evolution
1
580 - Plants (Botany)
1
658 - General management
1