Classification
320 - Political science
500 - Natural sciences & mathematics
600 - Technology
620 - Engineering & allied operations
6
900 - History & geography
380 - Commerce, communications & transportation
5
700 - The arts; fine & decorative arts
4
140 - Specific philosophical schools
3
340 - Law
3
363 - Other social problems & services
3
576 - Genetics & evolution
3
720 - Architecture
3
300 - Social sciences
2
333 - Economics of land & energy
2
370 - Education
2
100 - Philosophy & psychology
1
330 - Economics
1
400 - Language
1
414 - Phonology & phonetics
1
540 - Chemistry & allied sciences
1
610 - Medicine & health
1