Classification
330 - Economics
9
370 - Education
8
600 - Technology
6
300 - Social sciences
4
320 - Political science
3
700 - The arts; fine & decorative arts
3
160 - Logic
2
301 - Sociology & anthropology
2
380 - Commerce, communications & transportation
2
331 - Labor economics
1
333 - Economics of land & energy
1
360 - Social problems & services; associations
1
361 - Social problems & social welfare in general
1
378 - Higher education
1
608 - Inventions & patents
1
620 - Engineering & allied operations
1
630 - Agriculture & related technologies
1
658 - General management
1