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