Classification
330 - Economics
2
333 - Economics of land & energy
2
336 - Public finance
580 - Plants (Botany)
2
600 - Technology
658 - General management
2
000 - Computer science, information & general works
1
140 - Specific philosophical schools
1
320 - Political science
1
361 - Social problems & social welfare in general
1
363 - Other social problems & services
1
370 - Education
1
380 - Commerce, communications & transportation
1
551 - Geology, hydrology & meteorology
1
620 - Engineering & allied operations
1
630 - Agriculture & related technologies
1
800 - Literature & rhetoric
1