Classification
540 - Chemistry & allied sciences
700 - The arts; fine & decorative arts
15
620 - Engineering & allied operations
14
000 - Computer science, information & general works
12
600 - Technology
7
610 - Medicine & health
7
333 - Economics of land & energy
6
580 - Plants (Botany)
4
363 - Other social problems & services
3
330 - Economics
2
615 - Pharmacology & therapeutics
2
140 - Specific philosophical schools
1
304 - Factors affecting social behavior
1
361 - Social problems & social welfare in general
1
500 - Natural sciences & mathematics
1
630 - Agriculture & related technologies
1
720 - Architecture
1
800 - Literature & rhetoric
1
900 - History & geography
1