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