Classification
140 - Specific philosophical schools
333 - Economics of land & energy
380 - Commerce, communications & transportation
600 - Technology
700 - The arts; fine & decorative arts
330 - Economics
9
620 - Engineering & allied operations
9
900 - History & geography
8
363 - Other social problems & services
7
610 - Medicine & health
7
000 - Computer science, information & general works
6
576 - Genetics & evolution
6
320 - Political science
4
630 - Agriculture & related technologies
4
800 - Literature & rhetoric
4
304 - Factors affecting social behavior
3
340 - Law
3
400 - Language
3
720 - Architecture
3
170 - Ethics
2
300 - Social sciences
2
500 - Natural sciences & mathematics
2
580 - Plants (Botany)
2
370 - Education
1
540 - Chemistry & allied sciences
1
551 - Geology, hydrology & meteorology
1
581 - Specific topics in natural history
1
612 - Human physiology
1
657 - Accounting
1