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