Classification
600 - Technology
620 - Engineering & allied operations
11
540 - Chemistry & allied sciences
7
700 - The arts; fine & decorative arts
7
363 - Other social problems & services
6
333 - Economics of land & energy
5
900 - History & geography
5
000 - Computer science, information & general works
4
580 - Plants (Botany)
4
581 - Specific topics in natural history
3
630 - Agriculture & related technologies
3
330 - Economics
2
530 - Physics
2
576 - Genetics & evolution
2
610 - Medicine & health
2
170 - Ethics
1
304 - Factors affecting social behavior
1
380 - Commerce, communications & transportation
1
414 - Phonology & phonetics
1
500 - Natural sciences & mathematics
1
612 - Human physiology
1
720 - Architecture
1
800 - Literature & rhetoric
1