Classification
363 - Other social problems & services
4
140 - Specific philosophical schools
3
320 - Political science
3
330 - Economics
3
600 - Technology
3
620 - Engineering & allied operations
3
700 - The arts; fine & decorative arts
3
333 - Economics of land & energy
2
551 - Geology, hydrology & meteorology
2
500 - Natural sciences & mathematics
1
610 - Medicine & health
1
800 - Literature & rhetoric
1
900 - History & geography
1