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