Classification
330 - Economics
580 - Plants (Botany)
363 - Other social problems & services
5
333 - Economics of land & energy
4
551 - Geology, hydrology & meteorology
4
600 - Technology
4
000 - Computer science, information & general works
3
380 - Commerce, communications & transportation
3
610 - Medicine & health
3
140 - Specific philosophical schools
2
620 - Engineering & allied operations
2
700 - The arts; fine & decorative arts
2
304 - Factors affecting social behavior
1
320 - Political science
1
336 - Public finance
1
361 - Social problems & social welfare in general
1
530 - Physics
1
630 - Agriculture & related technologies
1
658 - General management
1
720 - Architecture
1
800 - Literature & rhetoric
1
900 - History & geography
1