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