Classification
330 - Economics
5
363 - Other social problems & services
3
333 - Economics of land & energy
2
320 - Political science
1
361 - Social problems & social welfare in general
1
380 - Commerce, communications & transportation
1
600 - Technology
1
620 - Engineering & allied operations
1
630 - Agriculture & related technologies
1
700 - The arts; fine & decorative arts
1
900 - History & geography
1