Classification
600 - Technology
8
363 - Other social problems & services
6
620 - Engineering & allied operations
6
700 - The arts; fine & decorative arts
6
333 - Economics of land & energy
5
900 - History & geography
5
330 - Economics
4
000 - Computer science, information & general works
3
580 - Plants (Botany)
3
320 - Political science
2
551 - Geology, hydrology & meteorology
2
581 - Specific topics in natural history
2
610 - Medicine & health
2
800 - Literature & rhetoric
2
140 - Specific philosophical schools
1
380 - Commerce, communications & transportation
1
576 - Genetics & evolution
1
630 - Agriculture & related technologies
1