Classification
140 - Specific philosophical schools
361 - Social problems & social welfare in general
600 - Technology
620 - Engineering & allied operations
700 - The arts; fine & decorative arts
3
000 - Computer science, information & general works
2
320 - Political science
2
610 - Medicine & health
2
630 - Agriculture & related technologies
2
170 - Ethics
1
330 - Economics
1
333 - Economics of land & energy
1
340 - Law
1
363 - Other social problems & services
1
380 - Commerce, communications & transportation
1
581 - Specific topics in natural history
1
900 - History & geography
1