Classification
600 - Technology
13
700 - The arts; fine & decorative arts
13
620 - Engineering & allied operations
10
900 - History & geography
10
000 - Computer science, information & general works
8
610 - Medicine & health
8
140 - Specific philosophical schools
4
363 - Other social problems & services
3
380 - Commerce, communications & transportation
3
333 - Economics of land & energy
2
400 - Language
2
304 - Factors affecting social behavior
1
530 - Physics
1
576 - Genetics & evolution
1
580 - Plants (Botany)
1
720 - Architecture
1