Classification
400 - Language
600 - Technology
800 - Literature & rhetoric
370 - Education
5
900 - History & geography
5
333 - Economics of land & energy
4
410 - Linguistics
4
140 - Specific philosophical schools
3
330 - Economics
3
380 - Commerce, communications & transportation
3
700 - The arts; fine & decorative arts
3
000 - Computer science, information & general works
2
304 - Factors affecting social behavior
2
610 - Medicine & health
2
363 - Other social problems & services
1
414 - Phonology & phonetics
1
530 - Physics
1