Classification
336 - Public finance
363 - Other social problems & services
30
333 - Economics of land & energy
21
330 - Economics
11
320 - Political science
9
380 - Commerce, communications & transportation
8
304 - Factors affecting social behavior
3
610 - Medicine & health
3
370 - Education
2
600 - Technology
2
140 - Specific philosophical schools
1
361 - Social problems & social welfare in general
1
551 - Geology, hydrology & meteorology
1
580 - Plants (Botany)
1
630 - Agriculture & related technologies
1
658 - General management
1
700 - The arts; fine & decorative arts
1
800 - Literature & rhetoric
1