Classification
333 - Economics of land & energy
576 - Genetics & evolution
700 - The arts; fine & decorative arts
9
600 - Technology
7
620 - Engineering & allied operations
6
900 - History & geography
6
363 - Other social problems & services
5
414 - Phonology & phonetics
3
580 - Plants (Botany)
3
380 - Commerce, communications & transportation
2
500 - Natural sciences & mathematics
2
000 - Computer science, information & general works
1
140 - Specific philosophical schools
1
304 - Factors affecting social behavior
1
540 - Chemistry & allied sciences
1
610 - Medicine & health
1
800 - Literature & rhetoric
1