Classification
540 - Chemistry & allied sciences
600 - Technology
630 - Agriculture & related technologies
620 - Engineering & allied operations
9
000 - Computer science, information & general works
5
333 - Economics of land & energy
5
700 - The arts; fine & decorative arts
5
330 - Economics
4
363 - Other social problems & services
4
610 - Medicine & health
3
320 - Political science
2
551 - Geology, hydrology & meteorology
2
900 - History & geography
2
140 - Specific philosophical schools
1
380 - Commerce, communications & transportation
1
400 - Language
1
414 - Phonology & phonetics
1
612 - Human physiology
1
657 - Accounting
1