Classification
330 - Economics
363 - Other social problems & services
8
551 - Geology, hydrology & meteorology
000 - Computer science, information & general works
4
333 - Economics of land & energy
4
610 - Medicine & health
4
581 - Specific topics in natural history
3
700 - The arts; fine & decorative arts
3
140 - Specific philosophical schools
2
320 - Political science
2
600 - Technology
2
620 - Engineering & allied operations
2
360 - Social problems & services; associations
1
540 - Chemistry & allied sciences
1
576 - Genetics & evolution
1
630 - Agriculture & related technologies
1
800 - Literature & rhetoric
1
900 - History & geography
1