Classification
140 - Specific philosophical schools
320 - Political science
3
361 - Social problems & social welfare in general
363 - Other social problems & services
380 - Commerce, communications & transportation
600 - Technology
3
000 - Computer science, information & general works
2
200 - Religion
2
581 - Specific topics in natural history
2
700 - The arts; fine & decorative arts
2
301 - Sociology & anthropology
1
330 - Economics
1
333 - Economics of land & energy
1
336 - Public finance
1
551 - Geology, hydrology & meteorology
1
580 - Plants (Botany)
1
658 - General management
1
800 - Literature & rhetoric
1