Classification
330 - Economics
380 - Commerce, communications & transportation
580 - Plants (Botany)
700 - The arts; fine & decorative arts
900 - History & geography
333 - Economics of land & energy
6
600 - Technology
4
620 - Engineering & allied operations
4
000 - Computer science, information & general works
3
363 - Other social problems & services
3
320 - Political science
2
304 - Factors affecting social behavior
1
370 - Education
1
540 - Chemistry & allied sciences
1
551 - Geology, hydrology & meteorology
1
576 - Genetics & evolution
1
610 - Medicine & health
1
630 - Agriculture & related technologies
1
658 - General management
1
720 - Architecture
1
800 - Literature & rhetoric
1