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