Classification
363 - Other social problems & services
380 - Commerce, communications & transportation
600 - Technology
658 - General management
900 - History & geography
620 - Engineering & allied operations
6
000 - Computer science, information & general works
4
330 - Economics
4
333 - Economics of land & energy
4
700 - The arts; fine & decorative arts
4
370 - Education
3
140 - Specific philosophical schools
2
410 - Linguistics
2
576 - Genetics & evolution
2
580 - Plants (Botany)
2
610 - Medicine & health
2
720 - Architecture
2
320 - Political science
1
400 - Language
1
800 - Literature & rhetoric
1