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