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