Classification
380 - Commerce, communications & transportation
600 - Technology
610 - Medicine & health
630 - Agriculture & related technologies
363 - Other social problems & services
6
580 - Plants (Botany)
6
620 - Engineering & allied operations
6
700 - The arts; fine & decorative arts
6
000 - Computer science, information & general works
5
333 - Economics of land & energy
5
140 - Specific philosophical schools
3
170 - Ethics
2
300 - Social sciences
2
340 - Law
2
551 - Geology, hydrology & meteorology
2
576 - Genetics & evolution
2
720 - Architecture
2
800 - Literature & rhetoric
2
900 - History & geography
2
330 - Economics
1
612 - Human physiology
1
658 - General management
1