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