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