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