Classification
333 - Economics of land & energy
380 - Commerce, communications & transportation
576 - Genetics & evolution
600 - Technology
5
620 - Engineering & allied operations
700 - The arts; fine & decorative arts
5
720 - Architecture
900 - History & geography
610 - Medicine & health
4
363 - Other social problems & services
3
800 - Literature & rhetoric
3
000 - Computer science, information & general works
2
140 - Specific philosophical schools
2
170 - Ethics
2
300 - Social sciences
2
340 - Law
2
580 - Plants (Botany)
2
630 - Agriculture & related technologies
2
330 - Economics
1