Classification
600 - Technology
6
620 - Engineering & allied operations
6
900 - History & geography
333 - Economics of land & energy
5
700 - The arts; fine & decorative arts
4
000 - Computer science, information & general works
3
330 - Economics
3
576 - Genetics & evolution
3
580 - Plants (Botany)
3
380 - Commerce, communications & transportation
2
720 - Architecture
2
363 - Other social problems & services
1