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