Classification
140 - Specific philosophical schools
363 - Other social problems & services
380 - Commerce, communications & transportation
658 - General management
330 - Economics
4
551 - Geology, hydrology & meteorology
4
600 - Technology
4
610 - Medicine & health
4
000 - Computer science, information & general works
3
333 - Economics of land & energy
3
370 - Education
3
576 - Genetics & evolution
3
620 - Engineering & allied operations
3
700 - The arts; fine & decorative arts
3
580 - Plants (Botany)
2
630 - Agriculture & related technologies
2
900 - History & geography
2
320 - Political science
1
336 - Public finance
1
361 - Social problems & social welfare in general
1
400 - Language
1
410 - Linguistics
1
720 - Architecture
1
800 - Literature & rhetoric
1