Classification
333 - Economics of land & energy
363 - Other social problems & services
380 - Commerce, communications & transportation
576 - Genetics & evolution
600 - Technology
700 - The arts; fine & decorative arts
10
000 - Computer science, information & general works
7
140 - Specific philosophical schools
5
330 - Economics
5
610 - Medicine & health
5
620 - Engineering & allied operations
5
900 - History & geography
5
340 - Law
4
320 - Political science
3
630 - Agriculture & related technologies
3
720 - Architecture
3
170 - Ethics
2
300 - Social sciences
2
370 - Education
2
530 - Physics
2
551 - Geology, hydrology & meteorology
2
580 - Plants (Botany)
2
581 - Specific topics in natural history
2
657 - Accounting
2
800 - Literature & rhetoric
2
304 - Factors affecting social behavior
1
650 - Management & auxiliary services
1
658 - General management
1