Classification
170 - Ethics
330 - Economics
320 - Political science
21
300 - Social sciences
8
363 - Other social problems & services
7
174 - Occupational ethics
6
331 - Labor economics
4
338 - Production
4
610 - Medicine & health
4
620 - Engineering & allied operations
4
658 - General management
4
100 - Philosophy & psychology
3
333 - Economics of land & energy
3
340 - Law
3
600 - Technology
3
900 - History & geography
3
000 - Computer science, information & general works
2
370 - Education
2
551 - Geology, hydrology & meteorology
2
700 - The arts; fine & decorative arts
2
001 - Knowledge
1
006 - Special computer methods
1
140 - Specific philosophical schools
1
160 - Logic
1
302 - Social interaction
1
304 - Factors affecting social behavior
1
361 - Social problems & social welfare in general
1
381 - Commerce
1
400 - Language
1
630 - Agriculture & related technologies
1
670 - Manufacturing
1
720 - Architecture
1
800 - Literature & rhetoric
1