Classification
300 - Social sciences
340 - Law
600 - Technology
700 - The arts; fine & decorative arts
900 - History & geography
380 - Commerce, communications & transportation
3
610 - Medicine & health
3
620 - Engineering & allied operations
3
800 - Literature & rhetoric
3
100 - Philosophy & psychology
2
140 - Specific philosophical schools
2
170 - Ethics
2
333 - Economics of land & energy
2
363 - Other social problems & services
2
576 - Genetics & evolution
2
580 - Plants (Botany)
2
630 - Agriculture & related technologies
2
720 - Architecture
2
320 - Political science
1
330 - Economics
1
370 - Education
1
400 - Language
1
658 - General management
1
780 - Music
1