Classification
320 - Political science
330 - Economics
363 - Other social problems & services
600 - Technology
2
658 - General management
800 - Literature & rhetoric
140 - Specific philosophical schools
1
333 - Economics of land & energy
1
336 - Public finance
1
361 - Social problems & social welfare in general
1
370 - Education
1
380 - Commerce, communications & transportation
1
551 - Geology, hydrology & meteorology
1
576 - Genetics & evolution
1
580 - Plants (Botany)
1