Classification
330 - Economics
363 - Other social problems & services
380 - Commerce, communications & transportation
551 - Geology, hydrology & meteorology
658 - General management
333 - Economics of land & energy
4
140 - Specific philosophical schools
3
320 - Political science
3
600 - Technology
3
610 - Medicine & health
3
580 - Plants (Botany)
2
630 - Agriculture & related technologies
2
700 - The arts; fine & decorative arts
2
000 - Computer science, information & general works
1
100 - Philosophy & psychology
1
170 - Ethics
1
336 - Public finance
1
361 - Social problems & social welfare in general
1
370 - Education
1
576 - Genetics & evolution
1
620 - Engineering & allied operations
1
800 - Literature & rhetoric
1