Classification
600 - Technology
20
620 - Engineering & allied operations
17
900 - History & geography
16
700 - The arts; fine & decorative arts
14
333 - Economics of land & energy
8
000 - Computer science, information & general works
6
330 - Economics
4
580 - Plants (Botany)
4
610 - Medicine & health
4
380 - Commerce, communications & transportation
3
370 - Education
2
530 - Physics
2
540 - Chemistry & allied sciences
2
140 - Specific philosophical schools
1
304 - Factors affecting social behavior
1
363 - Other social problems & services
1
500 - Natural sciences & mathematics
1
657 - Accounting
1
720 - Architecture
1
780 - Music
1
800 - Literature & rhetoric
1