Classification
330 - Economics
576 - Genetics & evolution
600 - Technology
620 - Engineering & allied operations
4
658 - General management
700 - The arts; fine & decorative arts
4
900 - History & geography
4
000 - Computer science, information & general works
2
720 - Architecture
2
100 - Philosophy & psychology
1
140 - Specific philosophical schools
1
300 - Social sciences
1
333 - Economics of land & energy
1
363 - Other social problems & services
1
370 - Education
1
380 - Commerce, communications & transportation
1
500 - Natural sciences & mathematics
1
530 - Physics
1
540 - Chemistry & allied sciences
1
580 - Plants (Botany)
1
800 - Literature & rhetoric
1