Classification
370 - Education
900 - History & geography
333 - Economics of land & energy
7
700 - The arts; fine & decorative arts
5
363 - Other social problems & services
3
780 - Music
3
100 - Philosophy & psychology
2
320 - Political science
2
330 - Economics
2
500 - Natural sciences & mathematics
2
600 - Technology
2
800 - Literature & rhetoric
2
140 - Specific philosophical schools
1
301 - Sociology & anthropology
1
304 - Factors affecting social behavior
1
400 - Language
1
551 - Geology, hydrology & meteorology
1
610 - Medicine & health
1
620 - Engineering & allied operations
1
720 - Architecture
1