Classification
320 - Political science
333 - Economics of land & energy
5
700 - The arts; fine & decorative arts
330 - Economics
4
363 - Other social problems & services
4
600 - Technology
4
140 - Specific philosophical schools
3
380 - Commerce, communications & transportation
3
551 - Geology, hydrology & meteorology
3
620 - Engineering & allied operations
3
900 - History & geography
3
000 - Computer science, information & general works
2
581 - Specific topics in natural history
2
610 - Medicine & health
2
370 - Education
1
414 - Phonology & phonetics
1
658 - General management
1
720 - Architecture
1