Classification
140 - Specific philosophical schools
4
330 - Economics
4
600 - Technology
4
620 - Engineering & allied operations
333 - Economics of land & energy
3
363 - Other social problems & services
3
700 - The arts; fine & decorative arts
3
900 - History & geography
3
320 - Political science
2
380 - Commerce, communications & transportation
2
000 - Computer science, information & general works
1
580 - Plants (Botany)
1
581 - Specific topics in natural history
1
610 - Medicine & health
1
658 - General management
1
720 - Architecture
1
800 - Literature & rhetoric
1