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