Classification
140 - Specific philosophical schools
320 - Political science
333 - Economics of land & energy
3
361 - Social problems & social welfare in general
610 - Medicine & health
000 - Computer science, information & general works
2
700 - The arts; fine & decorative arts
2
304 - Factors affecting social behavior
1
330 - Economics
1
363 - Other social problems & services
1
380 - Commerce, communications & transportation
1
600 - Technology
1
620 - Engineering & allied operations
1