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