Classification
600 - Technology
8
700 - The arts; fine & decorative arts
6
333 - Economics of land & energy
3
363 - Other social problems & services
3
580 - Plants (Botany)
3
620 - Engineering & allied operations
3
000 - Computer science, information & general works
2
540 - Chemistry & allied sciences
2
900 - History & geography
2
304 - Factors affecting social behavior
1
330 - Economics
1
380 - Commerce, communications & transportation
1
414 - Phonology & phonetics
1
500 - Natural sciences & mathematics
1
530 - Physics
1
576 - Genetics & evolution
1
610 - Medicine & health
1
800 - Literature & rhetoric
1