Classification
140 - Specific philosophical schools
170 - Ethics
340 - Law
600 - Technology
700 - The arts; fine & decorative arts
5
620 - Engineering & allied operations
4
900 - History & geography
4
300 - Social sciences
3
320 - Political science
3
333 - Economics of land & energy
3
576 - Genetics & evolution
3
580 - Plants (Botany)
3
304 - Factors affecting social behavior
2
363 - Other social problems & services
2
370 - Education
2
380 - Commerce, communications & transportation
2
610 - Medicine & health
2
630 - Agriculture & related technologies
2
720 - Architecture
2
800 - Literature & rhetoric
2
100 - Philosophy & psychology
1
120 - Epistemology, causation & humankind
1
301 - Sociology & anthropology
1
330 - Economics
1
361 - Social problems & social welfare in general
1
530 - Physics
1
551 - Geology, hydrology & meteorology
1
658 - General management
1