Classification
170 - Ethics
600 - Technology
610 - Medicine & health
700 - The arts; fine & decorative arts
000 - Computer science, information & general works
5
140 - Specific philosophical schools
5
363 - Other social problems & services
5
333 - Economics of land & energy
4
380 - Commerce, communications & transportation
4
620 - Engineering & allied operations
4
100 - Philosophy & psychology
3
300 - Social sciences
3
320 - Political science
3
330 - Economics
3
340 - Law
3
370 - Education
3
580 - Plants (Botany)
3
900 - History & geography
3
200 - Religion
2
361 - Social problems & social welfare in general
2
530 - Physics
2
576 - Genetics & evolution
2
630 - Agriculture & related technologies
2
720 - Architecture
2
800 - Literature & rhetoric
2
301 - Sociology & anthropology
1
350 - Public administration & military science
1
500 - Natural sciences & mathematics
1
581 - Specific topics in natural history
1
612 - Human physiology
1