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