Classification
363 - Other social problems & services
540 - Chemistry & allied sciences
600 - Technology
3
610 - Medicine & health
3
620 - Engineering & allied operations
3
000 - Computer science, information & general works
2
330 - Economics
2
581 - Specific topics in natural history
2
900 - History & geography
2
140 - Specific philosophical schools
1
304 - Factors affecting social behavior
1
320 - Political science
1
333 - Economics of land & energy
1
520 - Astronomy & allied sciences
1
700 - The arts; fine & decorative arts
1