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