Classification
600 - Technology
6
620 - Engineering & allied operations
330 - Economics
5
333 - Economics of land & energy
5
700 - The arts; fine & decorative arts
5
363 - Other social problems & services
4
380 - Commerce, communications & transportation
4
610 - Medicine & health
3
900 - History & geography
3
000 - Computer science, information & general works
2
140 - Specific philosophical schools
2
320 - Political science
2
658 - General management
2
340 - Law
1
400 - Language
1
551 - Geology, hydrology & meteorology
1
580 - Plants (Botany)
1
581 - Specific topics in natural history
1
630 - Agriculture & related technologies
1
800 - Literature & rhetoric
1