Classification
330 - Economics
370 - Education
500 - Natural sciences & mathematics
620 - Engineering & allied operations
600 - Technology
3
300 - Social sciences
2
333 - Economics of land & energy
2
700 - The arts; fine & decorative arts
2
900 - History & geography
2
100 - Philosophy & psychology
1
140 - Specific philosophical schools
1
304 - Factors affecting social behavior
1
340 - Law
1
363 - Other social problems & services
1
380 - Commerce, communications & transportation
1
400 - Language
1
530 - Physics
1
540 - Chemistry & allied sciences
1
576 - Genetics & evolution
1
658 - General management
1
720 - Architecture
1