Classification
320 - Political science
380 - Commerce, communications & transportation
551 - Geology, hydrology & meteorology
363 - Other social problems & services
6
333 - Economics of land & energy
5
000 - Computer science, information & general works
4
330 - Economics
4
600 - Technology
3
700 - The arts; fine & decorative arts
3
140 - Specific philosophical schools
2
580 - Plants (Botany)
2
630 - Agriculture & related technologies
2
800 - Literature & rhetoric
2
100 - Philosophy & psychology
1
170 - Ethics
1
304 - Factors affecting social behavior
1
370 - Education
1
530 - Physics
1
620 - Engineering & allied operations
1
658 - General management
1
720 - Architecture
1